Answer:
Explanation:
The amount of barium chloride used is 8.1 μmol and it was dissolved in a 50 mL flask. To find the concentration, we need to divide the amount of solute by the volume of solution:
Concentration = amount of solute / volume of solution
The volume of solution in liters is:
50 mL = 50 × 10^(-3) L = 0.050 L
So the concentration of the barium chloride solution in μmol/L is:
Concentration = 8.1 μmol / 0.050 L
Concentration = 162 μmol/L
Therefore, the concentration of the chemist's barium chloride solution is 162 μmol/L.
A student mixes 0.100 L of 1.00 M HA with 0.200 L of 1.00 M MOH according to the reaction below:HA(aq) + MOH(aq) → H2O (l) + MA(aq)a) If the temperature of the solutions changed from 22.3 °C to 29.1 °C, calculate the heat evolved in this reaction. (Assume that the specific heat of the solution is 4.184 J/g°C and the density of the solutions is 1.00 g/mL)b) Calculate the enthalpy per mole of HAc) If 0.491 moles of HA is reacted with excess MOH, how much heat would be evolved?
a. The heat evolved in the reaction is 33.1 J
b. The enthalpy per mole of HAc is 331 kJ/mol
c. The heat evolved when 0.491 moles of HA is reacted with excess MOH is 161.4 J
What is the heat that evolved in the reaction?The heat evolved in the reaction can be determined using the equation of heat change as follows:
ΔQ = mcΔT,
where;
m is the mass of the solution,c is the specific heat capacity, andΔT is the change in temperature.The mass of the solution, m = density * volume
the total volume of the solution is 0.100 L + 0.200 L = 0.300 L
the density of the solutions is 1.00 g/mL
and the mass can be calculated as follows:
The mass of the solution = 0.300 L * 1.00 g/mL
The mass of the solution = 0.300 g
Therefore, the heat evolved in the reaction will be:
ΔQ = 0.300 g * 4.184 * (29.1°C - 22.3°C)
ΔQ = 33.1 J
b) The enthalpy per mole of HAc = ΔQ / n
where n is the number of moles of HAc
n = 0.100 L * 1.00 M
n = 0.100 moles
enthalpy per mole of HAc = 33.1 / 0.001
enthalpy per mole of HAc = 331 kJ/mol
c) The heat evolved when 0.491 moles of HA is reacted with excess MOH is determined as follows:
Heat evolved = 0.491 mol * 331 kJ/mol
Heat evolved = 161.4 J
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When 25.00 mL of an unknown weak base is titrated with 0.122 M HCI, it takes 32.42 mL to reach the equivalence point. Reference Material pH = -log[H") (H+) = 10 pk = -log K K = 10 X pOH = -log(OH) (OH) = 10-POH pk = -log K K = 10pk Molar Mass HCI 36.458 g/mol The ionic product of water = Kw = [H] x [OH-] = 1.0 x 10-14 at 298 K. The expression varies with temperature a) What is the concentration, in M, of the weak base? Enter a number only, no text. b) At half-equivalence point, the pH is 11.58. What would be the Kb of the weak base? Enter a number only, no text 101
a) The concentration of the weak base is 0.0424 M.
b) The Kb of the weak base is 1.29 x 10^-12.
At the equivalence point, the number of moles of HCl added to the solution is equal to the number of moles of the weak base present in the solution.
So, we can calculate the number of moles of HCl that have been added to the solution:
Moles HCl = (0.122 M) * (0.03242 L)
= 0.003987 moles
To find the concentration of the weak base, we divide the number of moles of the weak base by the volume of the solution:
Concentration weak base = Moles weak base/volume
= (0.003987 moles) / (0.025 L) = 0.0424 M
At the half-equivalence point, the number of moles of HCl added to the solution is equal to half the number of moles of the weak base present in the solution.
So, we can calculate the number of moles of HCl that have been added to the solution:
Moles HCl = (0.122 M) * (0.03242 L) / 2 = 0.001994 moles
To find the concentration of the weak base, we divide the number of moles of the weak base by the volume of the solution:
Concentration weak base = Moles weak base/volume
= (0.001994 moles) / (0.025 L) = 0.0808 M
The concentration of the conjugate acid of the weak base can be calculated using the equation:
[H+] = Kw / [OH-] = (1.0 x 10^-14) / (0.0808 M)
= 1.235 x 10^-14 M
The pH of the solution can be calculated using the equation:
pH = -log[H+] = 11.58
The Kb of the weak base can be calculated using the equation:
Kb = Kw / [HA][A-] = (1.0 x 10^-14) / (0.0808 M) (0.0808 M)
= 1.29 x 10^-12
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classify each solid as a covalent, ionic, metallic, or molecular solid. drag the appropriate items to their respective bins. view available hint(s)for part a resethelp covalentdroppable ionicdroppable metallicdroppable moleculardroppable
The appropriate items to their respective bins are:
Covalent: Carbon dioxide
Ionic: Table salt
Metallic: Iron
Molecular: Sugar
What is bins?
Bins are containers used for storing and organizing items. They can be made from a variety of materials, including wood, metal, and plastic, and come in many shapes and sizes. Bins are often used in large warehouses, retail stores, and other business establishments to store and organize products, tools, and other items. In the home, bins can be used to store toys, shoes, and other items that need to be kept organized.
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For the following reaction, 3.59 grams of carbon tetrachloride are mixed with excess methane (CH4) . Assume that the percent yield of dichloromethane (CH2Cl2) is 65.5 %.What is the ideal yield of dichloromethane (CH2Cl2) ? What is the actual yield of dichloromethane (CH2Cl2)
The balanced chemical equation for the reaction is:
CCl4 + CH4 → 2CH2Cl2
From the balanced equation, we see that 1 mole of CCl4 reacts with 1 mole of CH4 to produce 2 moles of CH2Cl2.
To determine the theoretical yield of CH2Cl2, we need to convert the given mass of CCl4 to moles, using its molar mass:
Molar mass of CCl4 = 12.01 + 4(35.45) = 154.02 g/mol
Moles of CCl4 = 3.59 g / 154.02 g/mol = 0.0233 mol
Since 1 mole of CCl4 produces 2 moles of CH2Cl2, the theoretical yield of CH2Cl2 is:
Theoretical yield of CH2Cl2 = 2 × 0.0233 mol = 0.0466 mol
To determine the actual yield of CH2Cl2, we need to use the percent yield:
Percent yield = (actual yield / theoretical yield) × 100%
Rearranging this formula gives:
Actual yield = (percent yield / 100%) × theoretical yield
Substituting the given values, we get:
Actual yield = (65.5% / 100%) × 0.0466 mol = 0.0305 mol
Finally, we can convert the actual yield of CH2Cl2 to grams, using its molar mass:
Molar mass of CH2Cl2 = 12.01 + 2(35.45) = 84.93 g/mol
Mass of CH2Cl2 = 0.0305 mol × 84.93 g/mol = 2.59 g
Therefore, the ideal yield of CH2Cl2 is 0.0466 mol or 3.97 g, and the actual yield is 0.0305 mol or 2.59 g.
The diagram below shows a stack of rock layers. These layers have not changed position since they formed.
The fossils in Layer 2 are younger than those in Layer __ and older than the fossils in Layer __
Answer: The fossils in Layer 2 are younger than those in Layer 1, and older than the fossils in layer 3. (assuming layer 1 is at the bottom, and layer 3 is at the top.)
Explanation: Think of how this stack of rocks formed. Layer 1 would have deposited first along with it's fossils, followed by 2, 3, etc. Layer 2's fossils would be younger than Layer 1, but older than Layer 3.
a chemical reaction that requires an input of energy in order to proceed is termed ______, whereas one that releases energy is called ______.
A chemical reaction that requires an input of energy in order to proceed is termed Endothermic, whereas one that releases energy is called Exothermic.
The endothermic process is a word used to describe a reaction in which the system takes up heat from its environment. Photosynthesis, evaporating liquids, melting ice, dry ice, alkane cracking, thermal decomposition, ammonium chloride in water, and many more processes are examples of endothermic processes. A reaction that is exothermic is the opposite of one that is endothermic. It emits energy onto its surroundings as heat or light. Examples include neutralization, burning a chemical, fuel reactions, dry ice deposition, respiration, sulphuric acid solution in water, and many more.
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Ethanol, CH3CH2OH, is known as grain alcohol and is the alcohol found in alcoholic beverages. Calculate the mole fraction of ethanol in a solution that contains 4.76g of ethanol d
Answer:
Explanation:
To calculate the mole fraction of ethanol we need the number of moles of ethanol (n1) and the total number of moles of all solutes in the solution (n_total).
We know that molar mass of ethanol = 46.07 g/mol
First, we'll find the number of moles of ethanol:
n1 = mass / molar mass
n1 = 4.76 g / 46.07 g/mol
n1 = 0.1029 mol
Next, we'll find the total number of moles of all solutes in the solution:
n_total = n1
Finally, we'll use these values to find the mole fraction of ethanol:
mole fraction of ethanol = n1 / n_total
mole fraction of ethanol = 0.1029 mol / 0.1029 mol
mole fraction of ethanol = 1.00
Therefore, the mole fraction of ethanol in the solution is 1.00.
Reaction Of Ethylmagnesium Bromide With Which Of The Following compound yields a tertiary alcohol after quenching with aqueous acid?A.H2COB.ch3choC.(ch3)2coD.ethylene oxideE.n-buthylitium
The reaction of ethyl magnesium bromide with ethylene oxide would yield a tertiary alcohol after quenching with aqueous acid. Option D is correct.
Ethyl magnesium bromide is a Grignard reagent that can react with carbonyl compounds to form alcohols. In this reaction, the Grignard reagent adds to the carbon atom in the carbonyl group to form a intermediate that can be quenched with aqueous acid to form an alcohol.
In the case of ethylene oxide, the reaction of ethyl magnesium bromide would result in the formation of a tertiary alcohol. The structure of the intermediate can be represented as follows:
R-Mg-Br + CH₂=O-CH₂-O-CH₂-O → R-O-CH₂-CH₂-O-CH₂-O
After quenching with aqueous acid, the intermediate is protonated to give a tertiary alcohol:
R-O-CH₂-CH₂-O-CH₂-O + H₃O⁺ → R-OH + CH₃-O-CH₂-O-CH₂-OH
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1) If an ideal gas has a pressure of 6.83 atm, a temperature of 475 K, and a volume of 60.47 L, how many moles of gas are in the sample?
2) Solid ammonium chloride, NH4Cl, is formed by the reaction of gaseous ammonia, NH3, and hydrogen chloride, HCl.
NH3(g)+HCl(g)⟶NH4Cl(s)
A 6.00 g sample of NH3 gas and a 6.00 g sample of HCl gas are mixed in a 2.00 L flask at 25 ∘C.
How many grams of NH4Cl will be formed by this reaction?
What is the weighted average length of the nails in the drawer?
A. 350 cm
B. 333 cm
C. 5.00 cm
D. 3.50 cm
The weighted average length of the nails in the drawer can be found to be D. 3. 50 CM.
How to find the weighted average ?Multiply each number by its weight, then add the results to determine the weighted average. Find the sum of all the variables multiplied by their weight, then divide by the sum of the weights if the weights don't add up to one.
In formula form, this is:
= ∑ ( Percentage of abundance x Length of nail )
The weighted average length of nails is:
= ( 2. 50 x 70. 5%) + ( 5. 00 x 19. 0 %) + ( 7. 50 x 10. 5 % )
= 3. 50 cm
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When solid sodium hydroxide (NaOH) is placed into water the mixture begins to heat up
as the sodium hydroxide dissolves. In a given experiment a mixture of sodium hydroxide
and water had an initial temperature of 22.0 °C. After all the sodium hydroxide
dissolved completely the final temperature of the mixture was 27.2 °C. What is the
change in temperature (in Fahrenheit) of the mixture?
The change in temperature (in Fahrenheit) of the mixture is 41.36°F
What is the change in the temperature of the mixture?The change in the temperature of the mixture is obtained as follows:
The initial temperature of water = 22.0 °C.
The final temperature of the mixture of water and sodium hydroxide = 27.2 °C.
The difference in temperature = 27.2 °C - 22.0 °C.
The difference in temperature = 5.2 °C.
Converting degrees celsius to Fahrenheit:
(5.2°C × 9/5) + 32 = 41.36°F
Therefore, the difference in temperature in Fahrenheit is 41.36°F.
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calculate and report the formula weight for the phosphate ion and calcium phosphate
The weight of a calcium phosphate molecule is 310 amu. Phosphate ion's formula weight is 95 amu.
How can the weight in the formula be determined?
There are 3 calcium molecules, 2 phosphate atoms, and 8 oxygen atoms in calcium phosphate.
The white solids known as calcium phosphates have nutritional value and are present in many living things, such as bone mineral and tooth enamel. Colloidal calcium phosphate (CCP), which is found in milk in micelles bound to casein protein and exists in a colloidal form, is also known as calcium phosphate.
Ca = 3 x 40 = 120 amu
in which P=231=62 amu
for O=8×16=128
So, 310 amu is the total weight.
Phosphate is a
P = 131 = 31 amu
O = 416 = 64 amu
Thus, 95 amu is the total weight.
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When a sugar cube dissolves in coffee, it is an example of which of the following?A. a physical changeB. a chemical changeC. a change in an extensive propertyD. none of the above
Option (A) is correct. When a sugar cube dissolves in coffee, it is an example of physical change.
Dissolving sugar cubes in coffee, the sugar molecules dissolve in the liquid without undergoing any chemical reaction as the chemical bonds in the molecules of sugar are covalent. The sugar molecule does not react with coffee molecules. Dissolving some substances such as sodium chloride in water is a chemical reaction as the chemical composition of the reactant would change. Physical change is defined as the state of the matter where the physical state of a matter is changed. The composition of the substance does not change. The products can be reversed by physical means in case of physical change.
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which of the following are ways of describing solution concentrations? mole fraction percent by mass molarity molality all of the above
Mole fraction is the ratio of the number of moles of a component of a solution to the total number of moles of all components in the solution.
What is components ?Components are modular parts of a larger system or structure. They can be physical objects, such as a computer part, or abstract concepts, such as a software algorithm. Components are usually designed to work together in order to achieve a common goal. Components provide a way to break down complex tasks into smaller, manageable pieces. By combining multiple components, the overall system can be more efficient, reliable, and easier to maintain. Components are often reusable, meaning they can be used in multiple different systems or applications.
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How many grams of sand would you add to a 5.0 mL test tube, that has a mass of 10.0 g if you wanted it to float in the middle of the orange layer? (Don't include units in your answer)
The final mass in gram is (V-5.0)/2 + 10.0 g.
How do we calculate?we need to calculate the mass of the orange layer and add half of that to the 10.0 g test tube to make it float in the middle.
The density of the orange layer can be assumed to be around 1.0 g/mL and we can calculate the volume by subtracting the volume of the test tube (5.0 mL) from the total volume of the mixture.
We make the assumption that the total volume of the mixture is V mL.
Hence, the volume of the orange layer is (V-5.0) mL, and its mass is (V-5.0) g.
Half of the mass = (V-5.0)/2 g
and should be added to the 10.0 g test tube to make it float in the middle.
So in conclusion, the final answer is (V-5.0)/2 + 10.0 g.
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determine the concentration of solute in an aqueous sodium chloride solution and give the concentration units that your method provides
Measure the volume of solution, evaporate to dryness, measure mass of dried solid. Convert g of salt to moles, divide by volume of solution M and it now can be calculated as
[tex]$ \mathrm{ C_{ion} - C_{compound} \times \frac{n_{ion}}{n_{compund}} }[/tex]
What is chloride?Chloride is an ion that is formed when chlorine is combined with another element, such as sodium or potassium. It is an essential electrolyte in the body and helps regulate fluid balance, nerve conduction, and pH levels. Chloride is found in many foods, including table salt and processed foods, as well as in the body's fluids, such as sweat, saliva, and blood.
Chloride also plays a role in digestion, helping to break down foods. People usually get enough chloride in their diets, but too much can lead to high blood pressure, dehydration, and impaired kidney function. Chloride levels can be tested with a blood test, and abnormal levels may indicate a problem such as dehydration or kidney disease.
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Anyone please help. Will greatly appreciate it.
Th overall reaction is an exothermic reaction where the energy of products is higher than that of reactants, the bonds in products being stronger and the change in enthalpy is positive.
What is an exothermic reaction?An exothermic reaction is defined as a chemical reaction which involves release of energy in the form of light,heat .In these reactions, energy is transferred from system to surroundings rather than taking energy from surroundings into system as in endothermic reactions.
In an exothermic reaction,change in enthalpy is negative.Therefore, it can be inferred that net amount of energy which is required to start the exothermic reaction is less than the net amount which is released by the reaction.
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Hydrogen produced from a hydrolysis reaction was collected over water. The data is compiled in the table.
Total volume of H2(g) collected 94.00 mL
Temperature 26.0 °C
Barometric pressure 745 mmHg
Vapor pressure of water at 26.0 ° 25.5 mmHg
Calculate the moles of hydrogen gas produced by the reaction.
suppose you have implemented an algorithm in a method named foo, which takes an array of n floating point numbers as data. Suppose also that this algorithm has O(N3) best, average, and worst case time complexity and that a timing analysis of foo showed that approximately 2 seconds were required to process an array of size N = 256.What is the largest array (N) that foo could process in less than one hour?A. 512B. 1024C. 2048D. 4096
The largest array (N) that foo can process in less than an hour is 2048.
The algorithm is a logical sequence of problem-solving steps that are reviewed systematically.
The time complexity, T(n), is measured by the number of computational steps needed to run the algorithm as a function of input size n. The spatial complexity, S(n), is measured by the memory used by the data structure contained in the algorithm as a function of the input size n.
Using the magnitude of the algorithm's time/space complexity, we can determine the rate of increase in time (space) required by the algorithm as the input size n increases.
In the question:
N1³/N2³ = 3600/2 = 1800
N1³/ 2563 = 1800
N1³ = √1800 * 256
N1³ = 256 * 12.16
N1³ = 3114
so, it can process 3114 size lists.
So, out of the given option, the maximum array it can process in one hour is 2048.
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how many moles of sodium hydroxide are needed to produce 6.0 moles of calcium hydroxide according to the reaction below?
There would be 12 moles of sodium hydroxide are needed to produce 6.0 moles of calcium hydroxide.
First we should write the balance chemical reaction
CaCl₂ + 2NaOH → Ca(OH)₂ + 2NaCl
From the chemical reaction we know that 1 moles of CaCl₂ react with 2 moles NaOH produced 1 moles of calcium hydroxide and 2 moles of NaCl.
To calculated moles of sodium hydroxide are needed to produce 6.0 moles of calcium hydroxide we can use unitary method
Moles of NaOH = 2/1 x moles of calcium hydroxide
Moles of NaOH = 2/1 x 6 moles
Moles of NaOH = 12 moles
Therefore, to make 6.0 moles of calcium hydroxide, 12 moles of sodium hydroxide would be required.
Your question is incomplete but most probably your full question was
how many moles of sodium hydroxide are needed to produce 6.0 moles of calcium hydroxide according to the reaction below?
CaCl₂ + 2NaOH → Ca(OH)₂ + 2NaCl
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The average kinetic energy of the molecules in a gas sample depends only on the temperature, . However, given the same kinetic energies, a lighter molecule will move faster than a heavier molecule, as shown in the equation for rms speed
rms speed=3ℳ‾‾‾‾‾√
where =8.314 J/(mol⋅K) and ℳ is molar mass in kilograms per mole. Note that a joule is the same as a kilogram‑meter squared per second squared (kg·m2/s2).
What is the rms speed of O2 molecules at 433 K?
What is the rms speed of He atoms at 433 K?
483 m/s is the rms speed of O[tex]_2[/tex] molecules at 433 K. The average kinetic energy of the molecules in a gas sample depends only on the temperature.
What is speed?Speed may be defined as the distance traveled by an item in relation to the time it takes to travel that distance. In other words, it measures how rapidly an item travels but does not provide direction. The term "velocity" refers to the combination of direction and speed.
The SI unit system is most typically used to express speed. Rate is given in metres per second, or m/s, since distance is recorded in metres while time is recorded in seconds. Unit representation: The speed is represented by "s" and calculated in meters per second (ms-1).
Vrms= √3RT/M
substituting all the given values, we get
Vrms= √3×8.314×433/0.032=483 m/s
Therefore, 483 m/s is the rms speed of O[tex]_2[/tex] molecules at 433 K.
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what type of intermolecular forces exist between the following pairs: (a) hbr and h2s : dipole-dipole forces. (b) cl2 and cbr4, : dipole dipole forces. (c) i2 and no3-, : dipole-dipole forces. (d) nh3 and c6h6 : dipole-dipole forces.
The type of intermolecular forces existing between different pairs of molecules depends on the nature of the molecules involved.
(a) HBr and H2S: The intermolecular forces between HBr and H2S molecules are dipole-dipole forces. HBr is a polar molecule, with a partial positive charge on the hydrogen atom and a partial negative charge on the bromine atom. H2S is also a polar molecule, with a partial positive charge on the hydrogen atoms and a partial negative charge on the sulfur atom.
(b) Cl2 and CBr4: Cl2 and CBr4 are both nonpolar molecules, meaning they do not have a net charge distribution. As a result, the intermolecular forces between these molecules are dipole-dipole forces. These forces result from the interaction between the dipoles of the individual molecules.
(c) I2 and NO3-: I2 is a nonpolar molecule, while NO3- is a polar ion with a net negative charge. The intermolecular forces between these molecules are dipole-dipole forces, which occur between the dipoles of the individual molecules.
(d) NH3 and C6H6: NH3 is a polar molecule, with a partial positive charge on the hydrogen atoms and a partial negative charge on the nitrogen atom. C6H6 is a nonpolar molecule. The intermolecular forces between NH3 and C6H6 molecules are dipole-dipole forces, which occur between the polar NH3 and nonpolar C6H6 molecules.
In conclusion, the intermolecular forces between the pairs of molecules listed above are dipole-dipole forces, which are a result of the interaction between the polar or charged regions of the molecules.
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How many grams of diphosphorus trioxide, P2O3 will form if one uses 78 grams of oxygen?
Answer:
approximately 137.3 grams of P2O3 will form if one uses 78 grams of oxygen.
Explanation:
Diphosphorus trioxide, P2O3, is formed from the reaction of phosphorus with oxygen:
P4 + 5O2 -> 2P2O3
To determine how many grams of P2O3 will form from 78 grams of oxygen, we need to know how much phosphorus is also involved in the reaction. If we assume that there is enough phosphorus present, then we can calculate the amount of P2O3 that will be produced.
The balanced equation tells us that for every 2 moles of P2O3 that are produced, 4 moles of P4 and 5 moles of O2 are consumed. From the number of moles of O2, we can calculate the number of moles of P2O3 produced using the ratio from the balanced equation:
78 g O2 / (32 g/mol O2) = 2.43 mol O2
2.43 mol O2 * (2 mol P2O3 / 5 mol O2) = 0.972 mol P2O3
Finally, we can convert the number of moles of P2O3 to grams:
0.972 mol P2O3 * (141.94 g/mol P2O3) = 137.3 g P2O3
So, approximately 137.3 grams of P2O3 will form if one uses 78 grams of oxygen.
The following compounds, listed with their boiling points, are liquid at -10oC: butane, -0.5oC; ethanol, 78.3 oC; toluene, 110.6 oC. At -10 oC, which of these liquids would you expect to have the highest vapor pressure? Which the lowest? Explain.
Butane, -0.5°C has the highest vapor pressure.Toluene, 110.6°C has the lowest vapor pressure.
What is vapor pressure ?The equilibrium pressure of a vapor above its liquid (or solid) is the vapor pressure of a liquid (or solid); that is, the pressure of the vapor resulting from evaporation of a liquid (or solid) above a sample of the liquid (or solid) in a closed container.
As a result, the substance with the lowest boiling point will have the highest vapor pressure at room temperature. The substance with the lowest vapor pressure has the highest boiling point.
Thus, Butane, -0.5°C has the highest vapor pressure.Toluene, 110.6°C has the lowest vapor pressure.
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Use the following data to calculate the Ksp value for each solid.a. The solubility of CaC2O4 is 6.1 × 10−3 g/L.b. The solubility of BiI3 is 1.32 × 10−5 mol/L.
The solubility product constant (Ksp) of CaC2O4 is given by the equation: Ksp = [Ca₂⁺] x [C₂O₄²⁻] = (6.1 × 10⁻³)² = 3.721 × 10⁻⁵ g²/L².
The solubility product constant (Ksp) of BiI3 is given by the equation: Ksp = [Bi₃⁻] x [I⁻]³ = (1.32 × 10⁻⁵)³ = 2.228 × 10⁻¹⁵ mol³/L³.
The solubility product constant (Ksp) is a measure of the equilibrium between a solute and its saturated solution. It is calculated by multiplying the concentrations of the ions in the solution when the solution is saturated. When the Ksp value is greater than 1, the compound is considered to be soluble in water.
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NEED HELP WITH STOICHIOMETRY.
Lithium and oxygen react explosively to form lithium oxide. Write a balanced equation for this reaction (4Li+ 02-->Li_20 ) . Then calculate how many moles of lithium oxide will form if 1.68 mol of lithium are reacted with oxygen.
Answer:
0.42 moles
Explanation:
Use Stoichiometry to solve
[tex]\frac{1.68 moles-of-Li}{} *\frac{1 mole-of-Li2O}{4 mole-of Li} =0.42 moles[/tex]
Predict the missing component in the nuclear equation.
Answer:
my guess is A.
Explanation:
The volume of a sample of mercury was determined to be 13.77 cm³. What is the
volume of this sample reported in cubic inches?
The volume of the sample reported in cubic inches would be 0.84 [tex]in^3[/tex].
Unit conversionThe problem here has to do with converting from cm³ to [tex]in^3[/tex].
1 cm = 0.3937 inch
1 cm³ = 0.0610 [tex]in^3[/tex]
Thus, if
1 cm³ = 0.0610 [tex]in^3[/tex]
13.77 cm³ = 13.77 x 0.0610/1
= 0.84 [tex]in^3[/tex]
In other words, the volume of mercury determined to be 13.77 cm³ will be 0.83 reported in cubic inches.
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what is the most efficient way to make a hepes buffer at ph 8.5? what starting compounds and reagents will you use? hint: start by choosing the right h-h equation. calculate from pka etc.
The most efficient way to make a herpes buffer at ph 8.5 is 7.55.
In chemistry, a compound is a substance made up of or greater different chemical elements combined in a fixed ratio. while the elements come collectively, they react with every other and shape chemical bonds which can be difficult to interrupt. those bonds form due to sharing or replacing electrons between atoms.
A chemical compound is a chemical substance composed of many equal molecules containing atoms from a couple of chemical elements held collectively by using chemical bonds. A molecule along with atoms of the most effective one detail is consequently not a compound. A compound is a material composed of or greater additives. Water, carbon dioxide, and desk salt are some examples of compounds.
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The density of 70.5 wt% aqueous perchloric acid is 1.67 g/mL. a. How many grams of solution are in 1.000 L? b. How many grams of HClO4 are in 1.000 L? c. How many moles of HClO4 are in 1.000 L?
There would be 1670 g of solution in 1.000 L and 1,177.35 gram of HClO₄ are in 1.000 L. There are 11.72 moles of HClO₄ in 1 L.
There are 1000 mL in a liter, hence density indicates the amount of grams per mL.
Density =1.67 g / 1 mL = 1670 g / 1000 mL = 1670 g/ 1.0 L
so there would be 1670 g of solution in 1.000 L
We got aqueous perchloric acid 70.5 wt%, it means the amount of perchloric acid in 100 grams of solution is 70.5 grams. so mass of HClO₄ are in 1.000 L will be
mass of HClO₄ = 70.5% x1670 g/ 1.0 L = 1,177.35 gram
Moles of HClO₄ = mass / mass molar
Moles of HClO₄ = 1,177.35 gram/ 100.46 g/mol = 11.72 moles
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