Since the rate law is determined to be rate = k[NOPTH], it implies that the rate-determining step must involve the reactants NOPTH. In the given mechanism, the only step that involves NOPTH is Step 2, which has NO and H2 as reactants.
Therefore, Step 2 is the rate-determining step. Note that the rate law only provides information about the reactants that appear in the rate expression, but it does not provide information about the mechanism or the order of the steps. The rate law can be used to determine the overall reaction order, which is the sum of the exponents of the concentrations in the rate law. However, it does not provide information about the specific mechanism or the individual steps.
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A sample of propane, C3H8 , contains 11.2 moles of carbon atoms. How many total moles of atoms does the sample contain?
A sample of propane, [tex]C_{3}H_{8}[/tex], containing 11.2 moles of carbon atoms has a total of 41.066 moles of atoms.
How to determine the total atoms in molecule?To know the total moles of atoms in a sample of propane, [tex]C_{3}H_{8}[/tex], containing 11.2 moles of carbon atoms.
Step 1: Determine the moles of carbon and hydrogen in propane.
The chemical formula for propane is [tex]C_{3}H_{8}[/tex]. This means there are 3 moles of carbon atoms and 8 moles of hydrogen atoms in 1 mole of propane.
Step 2: Calculate the moles of propane.
Since the sample contains 11.2 moles of carbon atoms and there are 3 moles of carbon atoms in 1 mole of propane, divide the moles of carbon by 3 to find the moles of propane.
11.2 moles of C / 3 moles of C per mole of propane = 3.7333 moles of propane
Step 3: Calculate the total moles of atoms in the sample.
Now that we know there are 3.7333 moles of propane, we can calculate the total moles of atoms in the sample. For each mole of propane, there are 3 moles of carbon and 8 moles of hydrogen, totaling 11 moles of atoms.
3.7333 moles of propane * 11 moles of atoms per mole of propane = 41.066 moles of atoms
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If potassium carbonate is used to selectively precipitate one of the cations while leaving the other cation in solution, which cation will precipitate first
The cation that will precipitate first depends on the specific cations present in the solution, usually one with lower solubility, if we add potassium carbonate.
Potassium carbonate can selectively precipitate certain cations based on their solubility. Generally, cations with lower solubility in water will precipitate first when potassium carbonate is added to the solution. For example, if the solution contains calcium and magnesium cations, calcium carbonate has a lower solubility than magnesium carbonate, so calcium will precipitate first when potassium carbonate is added. Conversely, if the solution contains copper and iron cations, copper carbonate has a lower solubility than iron carbonate, so copper will precipitate first when potassium carbonate is added.
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1.60 moles Co, 1.60 moles H2O, 4.00 moles CO2, 4.00 moles H2 are found in a 8.00L container at 690C at equilibrium. Calculate the value of the equilibrium constant.
The value of the equilibrium constant is 6.25.
To calculate the equilibrium constant, we need to use the balanced chemical equation and the Law of Mass Action. The balanced chemical equation for the reaction is:
CO(g) + H2O(g) ⇌ CO2(g) + H2(g)
The Law of Mass Action expression for this reaction is:
Kc = [CO2][H2]/[CO][H2O]
where Kc is the equilibrium constant, and the square brackets denote molar concentrations.
From the given information, we know that:
[CO] = 1.60 moles/8.00 L = 0.20 M
[H2O] = 1.60 moles/8.00 L = 0.20 M
[CO2] = 4.00 moles/8.00 L = 0.50 M
[H2] = 4.00 moles/8.00 L = 0.50 M
Substituting these values into the Law of Mass Action expression gives:
Kc = (0.50)(0.50)/(0.20)(0.20) = 6.25
Therefore, the value of the equilibrium constant is 6.25.
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If the temperature of a flexible, gas-filled container is decreased at a fixed pressure, the volume of the container will
These instances of how temperature may change a confined gas's volume while maintaining a constant pressure are typical: The volume rises with rising temperature and falls with falling temperature.
Pressure and volume are inversely related for an ideal gas with a constant mass maintained at a set temperature. Boyle's law, another gas law, states that there is an inverse connection between a gas's pressure and volume.
When the temperature is maintained constant, pressure falls as volume increases and vice versa. If the temperature drops, either the volume or the pressure will drop, or perhaps a combination of the two. Only if the volume is remained constant will pressure rise. Volume-increase a flexible container.
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You need to present your observations from a chemistry experiment to the class. Which database feature should you use so that your presentation is organized and easy to view
If you need to present your observations from a chemistry experiment to the class, the database feature that you should use to organize and present your information effectively is tables. Tables are a powerful tool in database software that can help you organize, sort, filter, and analyze data in a meaningful way.
By using tables, you can organize your observations into rows and columns, which makes it easier to view and compare different sets of data. You can also use tables to sort your data by different criteria, such as date, time, or value, so that you can easily identify patterns and trends.
In addition, tables can be used to filter out unwanted data or to highlight specific data that you want to focus on. This is particularly useful if you have a large dataset and want to focus on a specific subset of data for your presentation.
Overall, using tables in your presentation is an effective way to organize and present your observations from a chemistry experiment in a clear and concise manner. It helps to make your presentation more visually appealing and easy to understand, and it allows your audience to quickly grasp the key points of your experiment.
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The indicator methyl orange is red below pH 3.2 and yellow above pH 4.4. When a drop of methyl orange is added to a solution of 0.00002 M HBr, what color will the solution become? a) red b) orange c) yellow
The indicator methyl orange is commonly used in acid-base titrations to detect the endpoint of the reaction. It changes color depending on the pH of the solution. Methyl orange is red below pH 3.2 and yellow above pH 4.4, making it a useful indicator for acidic solutions.
When a drop of methyl orange is added to a solution of 0.00002 M HBr, the solution will turn red. This is because HBr is a strong acid with a low pH value, which causes the methyl orange to turn red. Methyl orange acts as an acid-base indicator, and in the presence of an acid like HBr, it changes its color to red.
It's important to note that the concentration of the solution plays a vital role in determining the color change of the indicator. In this case, the concentration of HBr is very low, but it is still sufficient to cause the indicator to turn red.
In conclusion, when a drop of methyl orange is added to a solution of 0.00002 M HBr, the solution will become red due to the low pH value of the acid. This color change indicates that the solution is acidic.
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The standard reduction potential of X is 1.23 V and that of Y is -0.44 V; therefore X is oxidized by Y. True False
The statement " The standard reduction potential of X is 1.23 V and that of Y is -0.44 V; therefore X is oxidized by Y" is True. because standard reduction potential of X (1.23 V) is greater than that of Y (-0.44 V), X has a greater tendency to be reduced than Y.
Therefore, in a redox reaction, X would be oxidized (lose electrons) while Y would be reduced (gain electrons).
The standard reduction potential is a measure of the tendency of a substance to gain electrons and undergo reduction. A higher standard reduction potential indicates a greater tendency to be reduced, while a lower standard reduction potential indicates a lower tendency to be reduced.
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chemistry student must write down in her lab notebook the concentration of a solution of sodium thiosulfate. The concentration of a solution equals the mass of what's dissolved divided by the total volume of the solution. Here's how the student prepared the solution: The label on the graduated cylinder says: empty weight: 8.50g She put some solid sodium thiosulfate into the graduated cylinder and weighed it. With the sodium thiosulfate added, the cylinder weighed 51.5g. She added water to the graduated cylinder and dissolved the sodium thiosulfate completely. Then she read the total volume of the solution from the markings on the graduated cylinder. The total volume of the solution was 140.2mL. What concentration should the student write down in her lab notebook
The student weighed the sodium thiosulfate and found that it had a mass of 43.0 g (51.5 g – 8.50 g). The mass of the sodium thiosulfate divided by the total volume of the solution gives the concentration.
However, the total volume given is in milliliters, while the mass is in grams. To obtain the volume in liters, we divide the volume in milliliters by 1000.
Then, we divide the mass of the sodium thiosulfate by the volume in liters to get the concentration. Thus, the concentration of the sodium thiosulfate solution is:
Concentration = Mass of sodium thiosulfate / Volume of solution
Volume of solution = 140.2 mL / 1000 mL/L = 0.1402 L
Concentration = 43.0 g / 0.1402 L = 306.7 g/L
Therefore, the student should write down the concentration as 306.7 g/L in her lab notebook.
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specific heat is the heat required to raise the temperature of 1 g of a substance by 1 oc. based on this definition, what is the equation to calculate specific heat? select one: specific heat
The equation to calculate specific heat is Q = m x c x ΔT, where Q is the amount of heat energy absorbed or released, m is the mass, c is the specific heat, and ΔT is the change in temperature.
This equation helps to determine the amount of heat energy required to raise the temperature of a substance by a certain amount. Specific heat is an important property of a substance because it helps to determine how much heat energy is required to raise the temperature of a substance. Different substances have different specific heat capacities, which means that they require different amounts of heat energy to raise their temperature by the same amount. Understanding specific heat is important in many areas, including engineering, physics, and chemistry.
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Cuántos gramos de NaClO son necesarios para preparar 700 mL de una solución 0.5 M?
Na = 23g
Cl = 35.5
O = 16g
Redondea tu respuesta a 2 decimales. SIN UNIDAD
We need 26.08 grams of NaClO to prepare a 0.5 M solution in 700 mL of solution.
To calculate the amount of NaClO needed to prepare a 0.5 M solution in 700 mL of solution, we need to use the formula
moles = concentration (M) x volume (L)
First, we need to convert the volume of the solution to liters
700 mL = 0.7 L
Then, we can plug in the given concentration and volume into the formula and solve for moles
moles = 0.5 M x 0.7 L
moles = 0.35 mol
Now, we need to convert the moles of NaClO to grams. To do this, we need to use the molar mass of NaClO, which is
1 Na + 1 Cl + 1 O = 23 g + 35.5 g + 16 g = 74.5 g/mol
So, the mass of NaClO needed can be calculated as
mass = moles x molar mass
mass = 0.35 mol x 74.5 g/mol
mass = 26.08 g
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-- The given question in English is
"How many grams of NaClO are needed to prepare 700 mL of a 0.5 M solution?
Na = 23g
Cl = 35.5
O = 16g
Round your answer to 2 decimal places."--
You find a rock. It contains 8 parent atoms and 24 daughter atoms. How many half lives have passed since the rock formed
Approximately 2 half-lives have passed since the rock formed.
Based on the information provided, the rock contains 8 parent atoms and 24 daughter atoms. To determine the number of half-lives that have passed since the rock formed, we can use the formula:
N = N0 * (1/2)^n
Where N is the current number of parent atoms (8), N0 is the initial number of parent atoms, and n is the number of half-lives.
Since there are 24 daughter atoms and 8 parent atoms, the initial number of parent atoms (N0) is 8 + 24 = 32. Now we can solve for n:
8 = 32 * (1/2)^n
Dividing both sides by 32:
1/4 = (1/2)^n
Since (1/2)² = 1/4, the number of half-lives (n) that have passed is 2.
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Trans fats are _____. Group of answer choices generally found in foods containing polyunsaturated fatty acids (PUFAs) generally found in non-organic food produced commercially via a process called partial hydrogenation typically liquids at room temperature
Trans fats are a type of unsaturated fat that is generally found in foods containing polyunsaturated fatty acids (PUFAs). They are produced commercially through a process called partial hydrogenation, which converts liquid oils into solid fats. This process enhances the shelf life and stability of foods, which is why trans fats are commonly found in processed foods such as baked goods, fried foods, and snacks.
While PUFAs help to reduce cholesterol levels and inflammation, trans fats can raise bad cholesterol levels (LDL) and lower good cholesterol levels (HDL), leading to an increased risk of heart disease.
However, trans fats are not healthy for our bodies. They raise our levels of "bad" cholesterol, lower our levels of "good" cholesterol, and increase our risk of heart disease, stroke, and type 2 diabetes. The American Heart Association recommends limiting trans fat intake to less than 1% of our daily calorie intake.
It's important to note that not all foods containing PUFAs are high in trans fats. PUFAs are healthy fats that can be found in foods such as fatty fish, nuts, and seeds. To reduce your intake of trans fats, it's best to choose whole, unprocessed foods and to read food labels carefully to avoid foods that contain hydrogenated oils.
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A component that admits extra gas exhaust volume into the cylinder before compression is called a __________.
A component that admits extra gas exhaust volume into the cylinder before compression is called an exhaust gas recirculation (EGR) valve.
The EGR valve is a part of the engine's emission control system and is designed to reduce nitrogen oxide (NOx) emissions. By recirculating a portion of the exhaust gas back into the intake manifold, the EGR valve lowers the combustion temperature, reducing the formation of NOx gases.
This process helps to improve fuel efficiency and reduce pollution. The EGR valve is typically controlled by the engine's computer system and opens or closes to regulate the amount of exhaust gas being recirculated into the combustion chamber.
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6. A 37.8 g sample of copper at 74.5C is added to 20.0g of water at 14.6C in a calorimeter. What is the final temperature of the system
The final temperature of the system is 29.1C.
Using the principle of heat transfer, which states that the total amount of heat lost by the copper equals the total amount of heat gained by the water. Using the formula:
Q(copper) = -Q(water)
where,
Q(copper) is the heat lost by the copper
Q(water) is the heat gained by the water
and the negative sign indicates that the two quantities have opposite signs.
Calculating the heat lost by the copper:
Q₁=m₁c₁ΔT₁
where m₁ is the mass of the copper, c₁ is the specific heat capacity of copper (0.385 J/g°C), and ΔT₁ is the change in temperature of the copper.
m₁ = 37.8 g
c₁ = 0.385 J/g°C
ΔT₁ = T(final) - 74.5C
Next, we will calculate the heat gained by the water:
Q₂ = m₂c₂ΔT₂
where m₂ is the mass of the water, c₂ is the specific heat capacity of water (4.184 J/g°C), and ΔT₂ is the change in temperature of the water.
m₂ = 20.0 g
c₂ = 4.184 J/g°C
ΔT₂ = T(final) - 14.6C
Thus,
m₁c₁ΔT₁ = m₂c₂ΔT₂
Solving for T(final), we get:
T(final) = (m₂ × c₂ × 14.6C + m₁ × c₁ × 74.5C) / (m₂ × c₂ + m₁ × c₁ )
Substituting the given values, we get:
T(final) = (20.0 g × 4.184 J/g° C × 14.6C + 37.8 g × 0.385 J/g° C × 74.5C) / (20.0 g × 4.184 J/g° C + 37.8 g × 0.385 J/g° C)
T(final) = (1211.36 J + 1119.98 J) / (83.68 J/°C)
T(final) = 29.1C
Therefore, the system's final temperature is 29.1C.
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Pushing down on the sealed glass container causes the volume to __________ and the pressure to __________.
Pushing down on a sealed glass container causes the volume to decrease and the pressure to increase.
When you apply force on the container, the gas molecules inside become more compressed, occupying a smaller space. As a result, the volume inside the container reduces. The decrease in volume is directly related to the increase in pressure, as described by Boyle's Law. This law states that the pressure of a given quantity of gas is inversely proportional to its volume when the temperature remains constant. In other words, when the volume of a gas decreases, its pressure increases, and vice versa.
In practical applications, this principle is used in various devices such as syringes and hydraulic systems, where the manipulation of pressure and volume is essential for their operation. Understanding the relationship between volume and pressure in a sealed container is crucial for the safe and efficient use of such devices, as well as for gaining insights into the behavior of gases under varying conditions. So therefore when a sealed glass container is pushing down it will causes the volume to decrease and the pressure to increase.
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a student titrated 50.0ml of a 0.10m solution of a certain weak acid with naoh(aq) . the results are given in the graph above. identify a ph value between 2.5 and 7.5 at which the concentration of the weak acid being titrated is less than the concentration of its conjugate base.
the equivalence point of the titration occurred at approximately 35 mL of NaOH added. This corresponds to a pH of around 8.0.
To find a pH value between 2.5 and 7.5 where the concentration of the weak acid is less than its conjugate base, we need to look at the region before the equivalence point on the graph.
At the beginning of the titration, before any NaOH is added, the pH is determined by the weak acid. We can see from the graph that the pH starts at around 2.5. As NaOH is added, the pH increases and eventually reaches the equivalence point at pH 8.0.
Between the initial pH of 2.5 and the equivalence point at pH 8.0, there is a region where the weak acid is partially neutralized but not completely. This means that there are still some molecules of the weak acid present, but they are also partially converted to their conjugate base.
To find a pH value where the concentration of the weak acid is less than its conjugate base, we need to find a point on the graph where the pH is in the range of 2.5 to 7.5, and the curve is steep. This indicates that the solution is close to the equivalence point, where the concentration of the weak acid and its conjugate base are equal.
Looking at the graph, we can see that there is a steep part of the curve around pH 5.0. This suggests that at this pH, the weak acid is mostly converted to its conjugate base, and the concentration of the weak acid is less than that of its conjugate base. Therefore, a pH value between 2.5 and 7.5 where the concentration of the weak acid is less than its conjugate base is approximately 5.0.
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The addition of _______ alloy to glass ionomers produces a product that can be used for core buildups and the repair of fractured cusps and amalgam fillings as well as abutments for overdentures.
The addition of metal alloy to glass ionomers produces a product that can be used for core buildups and the repair of fractured cusps and amalgam fillings as well as abutments for overdentures.
Alloy is generally a metallic substance which is made of two or more elements. e.g., bronze.
The constituent of alloys may be metals or non-metals.
The formation of alloy produces wide variety of application.
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The exponents m, n, and p in the rate law equation rate = k[A]^m [B]^n [C]^p ...: Select the correct answer below: A. always correlate to the coefficients of reactants A, B and C in the balanced chemical equation. B. are determined using the molecular masses of reactants A, B and C in the balanced chemical equation. C. are dependent on the temperature and surface area of reactants A, B and C. D. are determined experimentally by observing how the rate of reaction changes as the concentrations of the reactants are changed.
The correct answer is D that states that the rate law can only be determined experimentally and is specific to the reaction being studied.
The exponents m, n, and p in the rate law equation rate = [tex]k[A]^m [B]^n [C]^p[/tex] are determined experimentally by observing how the rate of reaction changes as the concentrations of the reactants are changed. The rate law shows how the rate of a chemical reaction is dependent on the concentrations of the reactants. It is important to note that the exponents in the rate law are not always the same as the coefficients of the reactants in the balanced chemical equation. Changes in temperature and surface area can also affect the rate of reaction, but these factors are not directly related to the exponents in the rate law equation.
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Calculate the pH of a solution that was prepared with 0.73 g of HCl to produce 500 mL of aqueous solution. O 13 O 1.4 O 0.16 O 0.14
To calculate the pH of a solution prepared with 0.73 g of HCl to produce 500 mL of aqueous solution, we need to first determine the concentration of HCl in the solution.
The molecular weight of HCl is 36.5 g/mol, so 0.73 g of HCl is equivalent to 0.02 moles of HCl. When this is dissolved in 500 mL of water, the concentration of HCl in the solution can be calculated as follows:
Concentration = moles of solute / volume of solution in liters
Concentration = 0.02 moles / 0.5 L = 0.04 M
Now, we can use the concentration of HCl to calculate the pH of the solution. Since HCl is a strong acid, it will dissociate completely in water to form H+ ions.
The pH of a solution can be calculated using the equation:
pH = -log[H+]
Substituting the concentration of HCl in the above equation, we get:
pH = -log(0.04) = 1.4
Therefore, the pH of the solution prepared with 0.73 g of HCl to produce 500 mL of aqueous solution is 1.4. This is a highly acidic solution, as the pH is less than 7.
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The ________ lattice is one of the seven primitive three-dimensional lattices in which the relationship between the lattice vectors a, b, and c can be written as: a b c
The FCC lattice is one of the seven primitive three-dimensional lattices in which the relationship between the lattice vectors a, b, and c can be written as: a = b = c
The face-centered cubic (FCC) lattice is a fundamental type of crystal lattice structure that is commonly found in metals such as copper, silver, and gold, as well as in many metallic compounds. It is one of the seven primitive three-dimensional lattices, and its symmetry and packing efficiency make it an important structure in the study of materials science and engineering.
In an FCC lattice, the atoms or ions are arranged in a pattern where each atom is surrounded by twelve nearest neighbors, forming a cubical symmetry with an atom at each corner and one in the center of each cube face. The relationship between the lattice vectors a, b, and c in an FCC lattice can be written as a = b = c.
The FCC lattice has several unique properties that make it useful in many applications. For example, it has a high packing density, which makes it an efficient structure for storing and transmitting information in electronic devices. It is also highly symmetric, which allows for the creation of highly ordered arrays of atoms or ions, making it useful in the design of catalysts and other materials with specific properties.
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A 25.0 mL sample of an HCl solution is titrated with a NaOH solution. The equivalence point is reached with of base. The concentration of HCl is ________ M.
A 25.0 mL sample of an HCl solution is titrated with a NaOH solution. The equivalence point is reached with of base. The concentration of HCl is 0.100M.
To find the concentration of HCl, we need to use the equation: M1V1 = M2V2, where M1 is the concentration of HCl, V1 is the volume of HCl used, M2 is the concentration of NaOH, and V2 is the volume of NaOH used at the equivalence point.
We know that the volume of NaOH used at the equivalence point is 25.0 mL, which is also the volume of HCl used. We also know that the concentration of NaOH is typically given in the problem.
Let's assume the concentration of NaOH is 0.100 M. Therefore, using the equation above:
M1V1 = M2V2
M1(25.0 mL) = (0.100 M)(25.0 mL)
M1 = (0.100 M)(25.0 mL) / (25.0 mL)
M1 = 0.100 M
So, the concentration of HCl is 0.100 M.
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Name the synthetic polymer having repeated glucose units?
Answer: Cellulose
Explanation:
Cellulose is a polymer made with repeated glucose units bonded together by beta-linkages. Humans and many animals lack an enzyme to break the beta-linkages, so they do not digest cellulose. Certain animals, such as termites can digest cellulose, because bacteria possessing the enzyme are present in their gut.
Indicate how you would distinguish between the following pairs of compounds by using infrared spectroscopy. (6 pts) A) 1-Hexyne and 2-Hexyne B) Diethylamine and Butylamine
Infrared (IR) spectroscopy is a useful technique for distinguishing between different compounds based on their unique vibrational frequencies. For the first pair of compounds, 1-hexyne, and 2-hexyne, the main difference lies in the position of the triple bond between the carbon atoms.
IR spectroscopy can be used to distinguish between the two isomers based on their C≡C stretching frequency. Specifically, 1-hexyne would show a higher C≡C stretching frequency compared to 2-hexyne due to the presence of the triple bond closer to the end of the molecule. For the second pair of compounds, diethylamine, and butylamine, IR spectroscopy can distinguish between them based on their different functional groups. Diethylamine contains an amino group (-NH2) while butylamine contains a longer alkyl chain. Therefore, diethylamine would show an N-H stretching frequency in the IR spectrum, while butylamine would show a C-H stretching frequency due to its longer alkyl chain.
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Find the value of the equilibrium constant (Keq) and tel whether equilibrium lies to the left or the right. 2Fe (S) + 3H20 (g) +> Fe2O3 (s) + 3H2 (g)
At equilibrium (H2O] = 1.0 M, and [Hz] = 4.5 M.
1. The equilibrium constant for the reaction given that [H₂O] = 1 M and [H₂] = 4.5 M is 91.125
2. The equilibrium constant lies to the right
How do I determine the equilibrium constant?The following data were obtained from the question:
Equation: 2Fe(s) + 3H₂O(g) ⇌ Fe₂O₃(s) + 3H₂Concentration of water [H₂O] = 1 MConcentration of hydroge [H₂] = 4.5 MEquilibrium constant =?The equilibrium constant for the raection can be obtained as illustrated as follow:
Equilibrium constant = [Product]ᵐ / [Reactant]ⁿ
Equilibrium constant = [H₂]³ / [H₂O]³
Equilibrium constant = 4.5³ / 1³
Equilibrium constant = 91.125
From the above calculation, we can see that the equilibrium constant (i.e 91.125) is far greater than one. Thus, the equilibrium constant lies to the right.
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give common names for the following compounds. (a) (ch3)2choch(ch3)ch2ch3 (b) (ch3)3coch2ch(ch3)2
(a) The compound (CH3)2CHOCH(CH3)CH2CH3 is commonly known as diisopropyl ether.
It is an ether compound formed by the condensation of two isopropyl (CH3)2CH- groups with an oxygen atom in the middle. Diisopropyl ether is a clear, colorless liquid with a characteristic ether-like odor. It is commonly used as a solvent in various chemical reactions and as an extraction solvent due to its low boiling point and good solubility for a wide range of organic compounds. Additionally, diisopropyl ether can be employed as a starting material for the synthesis of other organic compounds.
(b) The compound (CH3)3COCH2CH(CH3)2 is commonly known as tert-butyl isobutyl ketone or 2,6-dimethyl-4-heptanone.
It is a ketone compound consisting of a tert-butyl (CH3)3C- group attached to the carbonyl carbon of an isobutyl (CH3)2CH- group. The name "tert-butyl isobutyl ketone" reflects the presence of both functional groups and the specific arrangement of carbon atoms in the molecule. 2,6-dimethyl-4-heptanone highlights the positions and types of the carbon atoms in the compound. This ketone compound finds applications as a solvent, flavoring agent, and intermediate in organic synthesis.
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You mix a 125.0-mL sample of a solution that is 0.0117 M in NiCl2 with a 175.0-mL sample of a solution that is 0.250 M in NH3. After the solution reaches equilibrium, what concentration of Ni2 (aq) remains
If you mix a 125.0-mL sample of a solution that is 0.0117 M in NiCl[tex]_2[/tex] with a 175.0-mL sample of a solution that is 0.250 M in NH[tex]_3[/tex]. After the solution reaches equilibrium, the concentration of [tex]Ni^{2+}[/tex] (aq) remains is 1.28 x 1[tex]0^{-5}[/tex] M.
To answer this question, we need to use the equilibrium constant expression for the reaction between NiCl[tex]_2[/tex] and NH[tex]_3[/tex]:
NiCl[tex]_2[/tex](aq) + 4NH[tex]_3[/tex](aq) ⇌ [tex][Ni(NH_3)_4]^{2+}[/tex] (aq) + 2C[tex]l^-[/tex](aq)
The equilibrium constant expression is:
K = [tex][Ni(NH_3)_4]^{2+}[/tex] / ([NiCl[tex]_2[/tex]][tex][NH_3]^4[/tex])
We can use this expression to calculate the concentration of [tex]Ni^{2+}[/tex] at equilibrium. First, we need to determine the initial concentrations of NiCl[tex]_2[/tex] and NH[tex]_3[/tex]:
[NiCl[tex]_2[/tex]] = 0.0117 M
[NH[tex]_3[/tex]] = 0.250 M
Next, we need to determine the concentrations of [tex][Ni(NH_3)_4]^{2+}[/tex] and C[tex]l^-[/tex] at equilibrium. We can do this by using the stoichiometry of the reaction and the initial concentrations of NiCl[tex]_2[/tex] and NH[tex]_3[/tex]:
[tex][Ni(NH_3)_4]^{2+}[/tex] = x
[Cl-] = 2x
where x is the change in concentration of [tex][Ni(NH_3)_4]^{2+}[/tex] and C[tex]l^-[/tex] at equilibrium.
Now we can substitute these concentrations into the equilibrium constant expression:
K = [x] / (0.0117 M * 0.250 [tex]M^4[/tex]* [tex][2x]^2[/tex])
Simplifying this expression, we get:
K = x / (2.9297 x [tex]10^{-10}[/tex][tex]x^2[/tex])
Solving for x, we get:
x = 1.28 x [tex]10^{-5 }[/tex] M
Therefore, the concentration of [tex]Ni^{2+}[/tex] at equilibrium is:
[[tex]Ni^{2+}[/tex]] = [tex][Ni(NH_3)_4]^{2+}[/tex] = 1.28 x [tex]10^{-5 }[/tex] M
So, the answer is 1.28 x [tex]10^{-5 }[/tex] M.
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A uniform deposit of 10.0 grams of silver is needed to completely coat a metal spoon with silver. How long ( in minutes ) would a current of 12.0 A have to be passed through a solution of AgNO3 to silver-coat the metal spoon
A current of 12.0 A would have to be passed through the solution for about 890 minutes (or about 14.8 hours) to silver-coat the metal spoon with 10.0 grams of silver.
The amount of silver deposited is directly proportional to the electric charge passed through the solution. The relationship is given by Faraday's law of electrolysis:
amount of substance = (electric charge) / (Faraday's constant * charge per mole of substance)
where Faraday's constant is the amount of electric charge carried by one mole of electrons (96485 C/mol for one-electron transfer reactions) and the charge per mole of silver is the charge on one silver ion (Ag+) (1 electron per ion).
We can rearrange this equation to solve for the time required:
time = (amount of substance) * (Faraday's constant * charge per mole of substance) / (current * charge per electron)
We have the amount of substance (10.0 g of silver) and the current (12.0 A), and we can look up the charge per mole of silver from the periodic table (the atomic weight of silver is 107.87 g/mol, so the charge per mole of silver is 1 mol Ag+
= [tex]1 * 6.0221*10^{23[/tex] ions [tex]* 1.6022*10^{-19} C/ion = 9.65*10^4 C/mol).[/tex]
Plugging in these values, we get:
time = [tex](10.0 g) * (96485 C/mol) / (12.0 A * 1.6022 * 10^{-19} C/electron)[/tex]
time = [tex]5.34*10^4[/tex] seconds
time = 890 minutes (rounded to the nearest minute)
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A chemist needs to know the concentration of an unlabeled bottle of hydrochloric acid. She titrates 16.0 mL of it with 1.18M magnesium hydroxide. It takes 48.0 mL of magnesium hydroxide to reach the endpoint. What is the concentration of the acid
To determine the concentration of the hydrochloric acid, the chemist used a titration method with a known concentration of magnesium hydroxide. The balanced chemical equation for the reaction is:
HCl (aq) + Mg(OH)2 (aq) → MgCl2 (aq) + 2H2O (l)
From the equation, we know that the ratio of moles of HCl to moles of Mg(OH)2 is 1:2. Therefore, the number of moles of Mg(OH)2 used in the titration is:
n(Mg(OH)2) = 1.18 mol/L × 48.0 mL × 1 L/1000 mL = 0.0566 mol
Since the ratio of moles of HCl to moles of Mg(OH)2 is 1:1, the number of moles of HCl is also 0.0566 mol. The concentration of the hydrochloric acid can be calculated by dividing the number of moles by the volume of the acid used in the titration:
C(HCl) = n(HCl)/V(HCl) = 0.0566 mol/16.0 mL × 1 L/1000 mL = 3.54 mol/L
Therefore, the concentration of the unlabeled bottle of hydrochloric acid is 3.54 mol/L.
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Write a Prolog predicate intersection(L1,L2,L3) that is true if L3 is equal to the list containing intersection of the elements in L1 and L2 without any duplicates. In other words, L3 should contain the elements that both in L1 and in L2. The order of the elements in L3 should be the same as the order in which the elements appear in L1.
The predicate intersection/3 is used to find the intersection of two lists, L1 and L2, and store the result in another list L3.
What is intersection ?
Intersection is a set operation that is used to find the common elements between two or more sets. It is often represented using the symbol ∩. It is used to identify the elements common to two or more sets, and the result of an intersection is a set that contains only the elements that are common to all sets. For example, if we want to find the intersection of two sets A and B, we take the elements of set A and compare them to the elements of set B. The result will be a set containing only the elements that are common to both sets A and B.
The predicate intersection/3 can be defined as follows:
intersection([],_,[]).
intersection([Head|Tail],List2,[Head|Intersect]) :-
member(Head,List2),
intersection(Tail,List2,Intersect).
intersection([Head|Tail],List2,Intersect) :-
\+member(Head,List2),
intersection(Tail,List2,Intersect).
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The specific heat of copper is 0.385 J/goC. Calculate the final temperature when 25.0 g of copper metal at 100oC is added to 50mL of water at 20oC.
The final temperature when 25.0 g of copper metal at 100oC is added to 50mL of water at 20oC is 180oC.
What is temperature?Temperature is a measure of the average heat energy of the particles in a substance or object. It is measured as a numerical value which is often expressed in either Celsius or Fahrenheit. Temperature is a physical property of matter and is a measure of how hot or cold something is. Temperature can be measured with a thermometer, and the higher the temperature, the more energy the particles have.
The equation for calculating heat is: Q = mcΔT
Where:
Q = heat (J)
m = mass of substance (g)
c = specific heat (J/goC)
ΔT = change in temperature (oC)
We can rearrange this equation to solve for ΔT: ΔT = Q / mc
Using the given information, we can calculate the final temperature:
Q = (25.0 g)(0.385 J/goC)(ΔT)
ΔT = Q / (25.0 g)(0.385 J/goC)
ΔT = (25.0 g)(0.385 J/goC)(100oC - 20oC) / (25.0 g)(0.385 J/goC)
ΔT = 80oC
The final temperature is 100oC + 80oC = 180oC.
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