The amount of excess NH4Cl remaining after the reaction is 55.7 g.
To find the amount of excess reagent in this reaction, we first need to write a balanced chemical equation for the reaction between aluminum nitrite (Al(NO3)2) and ammonium chloride (NH4Cl):
Al(NO3)2 + 6NH4Cl -> 2AlCl3 + 6NH3 + 6H2O
From this equation, we can see that for every 1 mole of Al(NO3)2, 6 moles of NH4Cl are required. We can determine the limiting reagent by finding the number of moles of each reactant and comparing them. The limiting reagent is the reactant that will run out first, meaning that the amount of product produced will be determined by the limiting reagent.
First, we'll find the number of moles of each reactant:
12.2 g Al(NO3)2 / 106 g/mol
= 0.115 mol Al(NO3)2
92.5 g NH4Cl / 53.5 g/mol
= 1.73 mol NH4Cl
Since 1.73 mol NH4Cl > 0.115 mol Al(NO3)2, we can say that
Al(NO3)2 is the limiting reagent NH4Cl is the excess reagent.The amount of NH4Cl used in the reaction is 0.115 mol Al(NO3)2 * 6 mol NH4Cl/1 mol Al(NO3)2 = 0.69 mol NH4Cl.
The amount of excess NH4Cl is 1.73 mol - 0.69 mol = 1.04 mol.
Finally, we can convert the number of moles of excess NH4Cl to grams:
1.04 mol * 53.5 g/mol = 55.7 g.
So, the amount of excess NH4Cl remaining after the reaction is 55.7 g to one decimal place.
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explain how tlc could be used to monitor the reduction of methoxybenzaldehyde to methoxybenzyl alcohol using nabh4 as a reducing agent.
The more polar compound will bind to the plate. On the TLC plate, the lowest one binds more strongly, so methoxybenzyl alcohol will have a lower Rf value than methoxy benzaldehyde.
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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lassify each of the substances as an atomic element, molecular element, molecular compound, or ionic compound. a. fluorine b. n2o c. silver d. k2o e. fe2o3
A class of chemical compound known as an ionic compound is made up of positively charged ions (cations) and negatively charged ions (anions) that are held together by electrostatic forces or ionic bonds
Ionic compounds: what are they?
. Typically, the formation of these compounds involves the transfer of electrons from a metal to a non-metal, which produces positive and negative ions.
At room temperature, ionic compounds are typically solid because they have high melting and boiling points. Additionally, when melted or dissolved, they conduct electricity. Ionic compounds include things like calcium carbonate (CaCO3), magnesium oxide (MgO), and sodium chloride (NaCl).
a. Fluorine - Atomic element
b. N2O - Molecular compound
c. Silver - Atomic element
d. K2O - Ionic compound
e. Fe2O3 - Ionic compound
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if a sample of oxygen gas contains 7.2 x10^23 oxygen atoms, what is the mass of the sample of oxygen gas?
The mass of the sample of oxygen gas is 115.2 x 10²³g.
What is The mass ?The mass is the quantity of matter that an object has and is measured in kilograms (kg). It is an important physical property of objects and is related to the inertia of an object, which is the tendency of an object to resist changes in its motion. Mass is a scalar quantity, meaning it has only magnitude and no direction. Mass is also distinct from weight, which is a measure of the force of gravity on an object.
Mass = (Number of atoms) x (Atomic Mass of Oxygen)
In this case, the number of oxygen atoms is 7.2 x 10²³ and the atomic mass of oxygen is 16.0 g/mol.
Therefore, the mass of the sample of oxygen gas is:
Mass = (7.2 x 10²³ atoms) x (16.0 g/mol)
Mass = 115.2 x 10²³ g
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1. Calculate the enthalpy change for the dissolution of SO3 in water to give H₂SO4: SO3(g) + H₂O(1)→ H₂SO4)(1) f Given: AH (SO3) = -395 kJ mol-¹ AH (H₂O) = -286 kJ mol-¹ f AH (H₂SO4) = -811 kJ mol¹. f
The enthalpy change for the dissolution of SO3 in water to give H₂SO4 is -130 kJ/mol.
What is enthalpy change?Enthalpy change (ΔH) is a thermodynamic quantity that represents the amount of heat energy absorbed or released in a chemical reaction or physical process at constant pressure.
The enthalpy change for the dissolution of SO3 in water to give H₂SO4 can be calculated using the equation: ΔH = ΔH products - ΔH reactants.
ΔH = (-811 kJ/mol) - [(−395 kJ/mol) + (-286 kJ/mol)] = -811 kJ/mol - (-681 kJ/mol) = -130 kJ/mol.
Therefore, the enthalpy change for the dissolution of SO3 in water to give H₂SO4 is -130 kJ/mol.
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how will you convert the masses of anhydrous MgSO4 and water to moles
Convert the mass of anhydrate to moles: Mass of anhydrate / Molar mass anhydrate =120.4g / 120.4g/mol = 1 mole MgSO4.
What is mass?One of a body's fundamental properties is its mass. In spite of having the same amount of matter in theory, different atoms and elementary particles have been found to have different masses.
In modern physics, there are a number of conceptually distinct but physically equivalent conceptions of mass. Experimentally, the body's resistance to acceleration (change in velocity) in the presence of a net force can be quantified as mass, which is the same as inertia. The mass of the object affects the gravitational pull it exerts on other bodies.
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PLEASE PLEASE HELP!! I WILL GIVE BRAINLYEST 5 STARS, A THANKS, AND 100 POINTS!!!!
Plate Tectonics Lab Report
Instructions: In the Plate Tectonics lab you will investigate the interactions between continental and oceanic plates at convergent, divergent, and transform boundaries around the globe. Record your observations in the lab report below. You will submit your completed report.
Name and Title:
Include your name, instructor's name, date, and name of lab.
Objective(s):
In your own words, what was the purpose of this lab?
Hypothesis:
In this section, please include the if/then statements you developed during your lab activity for each location on the map. These statements reflect your predicted outcomes for the experiment.
Location One: Select two events that you predict will be observed. If I explore two continental plates at a convergent boundary, then I will observe:
earthquakes
faults
ocean formation
mountains
volcanoes
island chains
seafloor spreading
Location Two: Select three events that you predict will be observed. If I explore two continental plates at a divergent boundary, then I will observe:
earthquakes
faults
ocean formation
mountains
volcanoes
island chains
seafloor spreading
Location Three: Select three events that you predict will be observed. If I explore two continental plates at a transform boundary, then I will observe:
earthquakes
faults
ocean formation
mountains
volcanoes
island chains
seafloor spreading
Location Four: Select two events that you predict will be observed. If I explore two oceanic plates at a convergent boundary, then I will observe:
earthquakes
faults
ocean formation
mountains
volcanoes
island chains
seafloor spreading
Location Five: Select three events that you predict will be observed. If I explore two oceanic plates at a divergent boundary, then I will observe:
earthquakes
faults
ocean formation
mountains
volcanoes
island chains
seafloor spreading
Location Six: Select two events that you predict will be observed. If I explore two oceanic plates at a transform boundary, then I will observe:
earthquakes
faults
ocean formation
mountains
volcanoes
island chains
seafloor spreading
Procedure:
The procedures are listed in your virtual lab. You do not need to repeat them here. Please be sure to identify the test variable (independent variable), outcome variable (dependent variable).
Reminder: Test variable = the item you are changing or manipulating; Outcome variable = the item you are measuring
Test variable (independent variable):
Outcome variable (dependent variable):
Data:
Record the data from each location below.
Location Name Boundary Type
(C=Convergent, D=Divergent, or T=Transform) Year Observed
(5, 10, or 20 million years) Geologic Events Observed
(earthquakes, faults, ocean formation, mountains, volcanoes, island chains, seafloor spreading)
Location One
Himalayas 5 Event 1-
20 Event 2-
Location Two
East Africa 5 Event 1-
10 Event 2-
20 Event 3-
Location Three
San Andreas fault zone 5 Event 1-
10 Event 2-
20 Event 3-
Location Four
Aleutian Islands 5 Event 1-
20 Event 2-
Location Five
Mid-Atlantic Ridge 5 Event 1-
10 Event 2-
20 Event 3-
Location Six
Alpine Fault 5 Event 1-
20 Event 2-
Conclusion:
Your conclusion will include a summary of the lab results and an interpretation of the results. Please write in complete sentences.
What types of geological events or changes occur at divergent plate boundaries?
What types of geological events or changes occur at convergent plate boundaries?
What types of geological events or changes occur at transform plate boundaries?
Explain how these geological processes and interactions have changed Earth's surface through the years. Be sure to use evidence to support your answer.
Name and Title: Miles Junior
[Instructor's Name]: Tom Hales
[Date] - February, 7th , 2023.
Plate Tectonics Lab Report (see attached document)
Objective(s): The purpose of this lab was to investigate the interactions between continental and oceanic plates at convergent, divergent, and transform boundaries around the world and to record observations in the lab report.
What is the experiment about?At divergent plate boundaries, geological events such as earthquakes, faults, and ocean formation occur. At convergent plate boundaries, earthquakes, faults, mountains, and volcanoes occur. At transform plate boundaries, earthquakes and faults occur.
Through the years, these geological processes and interactions have changed the Earth's surface by creating new land, causing earthquakes, and creating new oceanic and continental crust. This lab showed that the interactions between plates at different boundaries have different outcomes and have a significant impact on the Earth's surface over time.
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Allicin is the compound responsible for the characteristic smell of garlic. An analysis of the compound gives the following percentage composition: 44.4% C, 6.21% H, 39.5% S and 9.86% O
a)Calculate the empirical formula of allicin
b)If the molar mass of allicin is 162, find the molecular formula of allicin
The empirical formula of the given compound is C₆H₁₀S₂O. The empirical mass and molecular mass is equal here. Hence, the molecular formula of allicin is the same.
What is empirical formula ?The empirical formula of a compound is determined using the mass presents and number of moles of each element present in it.
Given, 44.4 % of C- 44.4 g of C contains = 44.4 g/12 g/mol= 3.7 moles.
number of moles of H = 6.21
number of moles of S = 39.5 g/32 g/mol = 1.23 moles
no.of moles of O = 9.86 g/16 g/mol = 0.61 moles.
Divide all of these number of moles by 0.61, we get the ratio and empirical formula as:
C₆H₁₀S₂O.
The formula mass = (6 ×12) + (10) + (2 × 32) + (16) = 162 g/mol.
Molecular mass = 162 g/mol.
Therefore, the molecular formula of the compound is the same C₆H₁₀S₂O.
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What phase of matter holds its shape, has definite volume and is rigid?
solids, phase of matter holds its shape, has definite volume and is rigid
One of the three fundamental states of matter, along with liquid and gas. (Ionized gases or plasmas are occasionally regarded as the fourth state of matter.) Because the energy of atoms lowers when they occupy a reasonably organised, three-dimensional structure, a solid develops from a liquid or gas. Solids differ from liquids and gases in that they have particular properties. For instance, all solids can withstand forces that are parallel or perpendicular to a surface (i.e., normal or shear loads, respectively). Those characteristics are influenced by the solid's constituent atoms' characteristics, their arrangement, and the forces that act between them.
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12. The heat of combustion of ethene is Calculate the heat of formation of the co that AH (CO₂) and AH (H₂O) are -39 f
10_20 20_30 30_40 40_50 50_60
the two molecular scenes below depict the relative concentrations of h3o (purple) in solutions of the same volume (with counterions and solvent molecules omitted for clarity). if the ph in beaker a is 4.45, what is the ph in beaker b?
The pH of a solution is determined by the concentration of hydrogen ions (H+) in the solutio The pH in beaker B is 6.45.
What is concentration?Concentration is the ability to focus and maintain attention on a task or thought for an extended period of time. It involves using mental effort to maintain focus and block out distractions. Concentration is important for studying, problem-solving, and other activities that require sustained attention. It can be trained and improved with practice. Strategies such as eliminating distractions, breaking tasks into smaller steps, and taking regular breaks can help to improve concentration.
In Beaker A, we can see that the concentration of H3O+ is greater than Beaker B, which indicates that Beaker A has a lower pH. Since the pH in Beaker A is 4.45, this implies that the pH in Beaker B must be higher. To calculate the exact pH of Beaker B, we would need to know the exact concentration of H3O+ in each beaker.
The pH of a solution is determined by the concentration of hydrogen ions (H+) in the solutio The pH in beaker B is 6.45.
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Red light has a _____ frequency and a _____ wavelength than ultraviolet rays.
Red light has a lower frequency and a longer wavelength than ultraviolet rays.
Red light is a type of electromagnetic radiation with a wavelength between 630 and 700 nanometers, and a frequency of about 480 to 430 terahertz. It is one of the colors of the visible spectrum and is known for its longer wavelength and lower frequency compared to other colors like blue or violet. Red light is used in a variety of applications, including in traffic lights, in phototherapy to treat skin conditions, and in night-vision devices to preserve night vision.
Ultraviolet (UV) light is a type of electromagnetic radiation with a wavelength shorter than that of visible light but longer than X-rays. It has a frequency range of about 10 to 400 terahertz, and its wavelength ranges from about 100 to 400 nanometers. UV light is divided into three categories: UVA, UVB, and UVC, with UVC having the shortest wavelength and highest frequency. Although UV light is invisible to the human eye, it can cause sunburn and other skin damage, and is also used in various applications such as water purification, air purification, and in black light to illuminate fluorescent materials.
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PLS HELP I WILL GIVE BRAINLIST
Answer:
plants make their own food using the process of photosynthesis. plants capture energy from sunlight which they use to combine carbon dioxide and water. the products include glucose which is food for the plant the other product is oxygen gas.
Explanation:
Hope this halps you !!!!!
Answer:
Hi there!
Plants make their own food using the process of photosynthesis.
Plants capture energy from sunlight which they use to combine carbon dioxide and water.
The products include glucose which is food for the plant the other product is oxygen gas.
The other product is oxygen.
Explanation:
Hope this helps!
Brainiest? Can you click on the crown on my answer? Thanks!
when 7.00 g of hydrogen react with 70.0 g of nitrogen, hydrogen is considered the limiting reactant because
Hydrogen is considered the limiting reactant in this reaction because it is present in a smaller amount compared to nitrogen.
The limiting reactant is the reactant that is completely consumed before the other reactant, and determines the amount of product that can be produced.
In a chemical reaction, the limiting reactant is the one that limits the amount of product that can be formed, because it is the one that is used up first. In this case, the reaction between 7.00 g of hydrogen and 70.0 g of nitrogen can only produce a certain amount of product based on the amount of hydrogen available. Once the hydrogen has reacted, no further reaction can occur.
It is important to identify the limiting reactant in a chemical reaction because it helps to determine the theoretical yield of the reaction, which is the maximum amount of product that can be produced. The theoretical yield can then be compared to the actual yield to evaluate the efficiency of the reaction.
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how to calculate the change in temperature of the cold water and the change in temperature of the hot water
To calculate the change in temperature of the cold water and the hot water is
ΔT = T (final) - T (initial)
To calculate the change in temperature you need to know the initial temperature of each water sample and the final temperature after they are mixed.
where ΔT represents the change in temperature, T final represents the final temperature, and T initial represents the initial temperature.
For example, if you have 50 grams of cold water at 10°C and 50 grams of hot water at 80°C, and after mixing, the final temperature is 60°C, then you can calculate the change in temperature for the cold water as follows:
ΔTcold water = T final - T initial cold water = 60°C - 10°C = 50°C
And for the hot water:
ΔT hot water = T final - T initial hot water = 60°C - 80°C = -20°C
the change in temperature of the cold water is positive, which means that its temperature has increased, while the change in temperature of the hot water is negative, which means that its temperature has decreased.
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Someone send me an essay of the important human values
Diffusion rate is fastest when the concentration gradient is:________
The Diffusion rate is fastest when the concentration gradient is higher.
The diffusion is defined the movement of the molecules from the higher concentration to the lower concentration. It occurs because of the random movement of the molecules. The rate of the diffusion be affected by the concentration gradient, the temperature, and the surface area of the cell membrane.
The difference between the concentration of the substance in the two areas will forms the concentration gradient. The rate of the diffusion is directly proportional to the concentration gradient. The Higher the concentration gradient, the faster the rate of the diffusion.
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a potassium hydroxide (KOH) solution has a molar concentration of 0.026 M. calculate the [H3O+], [OH-] , and the pH of the solution
A 0.026 M KOH solution has [tex][OH-] = 0.026 M, [H3O+] = 10^(-13) M[/tex], and a pH of 12.97.
A potassium hydroxide (KOH) solution is a strong base and dissociates completely in water to produce hydroxide ions (OH-). The molar concentration of KOH can be used to calculate the concentration of hydroxide ions.
[tex][OH-] = 0.026 M[/tex]
The hydroxide ions will react with water to produce hydronium ions (H3O+), according to the equation:
[tex]OH- + H2O - > H3O+ + OH-[/tex]
The concentration of hydronium ions can be calculated using the equation:
[tex][H3O+] = Kw/[OH-] = 10^(-14)/[OH-] = 10^(-14)/0.026 = 10^(-13) M[/tex]
The pH of the solution can be calculated using the equation:
[tex]pH = -log[H3O+] = -log(10^(-13)) = 13.[/tex]
Therefore, the pH of the 0.026 M KOH solution is 12.97.
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how many grams of solute are present in 35.0 ml of 0.236 m sodium sulfate? a. what is the molarity of the sodium ions?
The molarity of sodium ions is 0.118
Molarity (M) is the amount of a substance in a sure extent of solution. Molarity is described because the moles of a solute are in keeping with the liters of an answer. Molarity is also referred to as the molar concentration of an answer.
The molarity of a given solution is described as the overall quantity of moles of solute per liter of answer. The molality of an answer is depending on the adjustments in physical properties of the machine along with strain and temperature as unlike mass, the volume of the gadget adjusts with the change in bodily situations of the gadget. Molarity is represented through M, that's termed as molar. One molar is the molarity of a solution wherein one gram of solute is dissolved in a liter of answer.
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help me 8th grade need answer ASAP!!!!!!!!!!!!!!!!! science
Examining the graph the missing parts are
21. pressure
22. Solid
23. condensation
24. gas
What is phase diagram?A phase diagram is a graphical representation of the conditions (temperature, pressure, and composition) under which different phases of a substance exist in thermodynamic equilibrium with each other. It is a powerful tool for understanding the behavior of a substance under varying conditions, and for predicting the conditions under which a particular phase of the substance will form or transform into another phase.
A typical phase diagram shows the boundary lines separating different phases, such as solid, liquid, and gas, and indicates the conditions under which each phase is stable.
The phase diagram can also indicate the conditions under which a substance will undergo a phase transition, such as melting or boiling, and the conditions under which the substance will be in a single phase, such as a supercritical fluid.
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If I start the following reaction with 5 moles of oxygen how many moles of MgO will be produced?
We will produce 6 moles of magnesium oxide
What does a mole with cancer look like?a rough border Typically, the edges are jagged, scalloped, or fuzzy in appearance. The nearby skin may be covered by the pigment. erratic color: There could be shades of tan, brown, and black. It's also possible to have patches of white, black, red, pink, or blue color.
If we have 6 moles of magnesium, then we use the ratios from the balanced equation to find the moles of oxygen needed
MOLES O₂ = MOLES MG * (1 O₂ / 2 Mg) <--- we get this from equation
= 6 mol Mg * (1 O₂ / 2 Mg)
= 3 mol O₂
We need 3 moles of oxygen otherwise we will not have all 6 moles of magnesium react. This will product
MOLES MgO = MOLES MG * (2 MgO / 2 Mg)
= 6 mol Mg * (2 MgO / 2 Mg)
= 6 mol MgO
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A student works a problem and finds that a compound has 0.074 moles of carbon and 0.148 moles of oxygen. What is the empirical formula of the compound?
Given the number of moles of carbon in the compound is 0.074 and the number of moles of oxygen is 0.148 moles. Convert these numbers to whole number ratios we get the empirical formula of the compound as CO₂.
What is empirical formula ?The empirical formula of a compound is derived from the number of moles of the constituent elements of the compound. The mole ratio of the elements give the subscripts in the formula.
Given,
number of moles of carbon in the compound = 0.074 moles
number of moles of oxygen = 0.148 moles
mole ratio of C to O is 0.074 : 0.148.
Divide both numbers by 0.074 to get whole numbers. we will obtain 1:2.
Hence, carbon and oxygen are in the ratio of 1:2 and the formula of the compound is CO₂.
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Sodium chloride is a soluble salt that can be made by mixing sodium hydroxide with an acid. Sodium metal cannot be used because it is too... what?
Answer:
Reactive.
Explanation:
am sure bro..…….
Because it is too reactive, sodium metal cannot be used to make sodium chloride. Since sodium is a highly reactive alkali metal, it easily interacts with other substances to form new ones.
What is the intraction of the sodium ?Sodium metal interacts fast with water to produce sodium hydroxide and hydrogen gas. The metal may catch fire and burn as a result of this reaction since it is so exothermic, or heat-producing.
Sodium metal interacts fast with acids like hydrochloric acid to produce sodium chloride and hydrogen gas. However, handling this reaction can be risky due to its high exothermic nature.
There is a significant safety risk since the heat from the reaction might cause the acid to boil and spray.Boil and spatter poses a major risk to people's safety. In comparison, using sodium hydroxide to create sodium chloride is significantly safer.
When sodium hydroxide and an acid are combined, the reaction is significantly slower and less exothermic. This response is considerably simpler to manage and does not provide a significant risk to safety. Sodium hydroxide is also considerably simpler to get than sodium metal. As a result, it is the technique of choice for producing sodium chloride.
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A total of 8 L of He is stored at sea level (1013 mb). If the gas is carried to the top of a mountain where the pressure is 500 mb, what volume will it occupy if the temperature and mass are held constant?
Here, the final volume can be determined using Boyle's law. The volume at 1013 mb pressure is 8 L. Then the volume at 500 mb will be 16 L.
What is Boyle's law ?Boyle's law states that, at constant temperature, the volume of a gas is inversely proportional to the pressure of the gas.
Hence, PV = a constant.
Let P1 and V1 be the initial pressure and volume and P2 and V2 be the final pressure and volume then we can write it as,
P1 V1 = P2 V2.
Given that, P1 = 1013 mb
P2 = 500 mb
V1 = 8 l
V2 = P1 V1 / P2
V2 = 1013 mb × 8 L /500 mb
= 16 L.
Therefore, the volume of the gas at a pressure of 500 mb is 16 l.
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Calculate ΔH for 2 NO(g) + O2(g) → N2O4(g) using the following information: N2O4(g)2 NO(g) + O2(g)→→2 NO2(g)2 NO2(g)ΔHΔH==+57. 9 kJ−113. 1 kJ Calculate for using the following information: 2. 7 kJ -55. 2 kJ -85. 5 kJ -171. 0 kJ +55. 2 kJ
The enthalpy of reaction for 2 NO(g) + O2(g) → N2O4(g) is ΔH = 57.9 kJ - (2.7 kJ + 55.2 kJ + 85.5 kJ - 171.0 kJ) = -115.5 kJ.
The reaction of 2 NO(g) + O2(g) → N2O4(g) is favored at high temperatures, due to the large negative enthalpy value.
This means that the reaction will proceed more quickly at higher temperatures, as the energy released from the reaction helps to increase the reaction rate. In addition, the reaction of 2 NO(g) + O2(g) → N2O4(g) is also favored at higher pressures, as the increased pressure helps to drive the reaction forward.
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Calculate the number of moles of helium that contains 3.29 × 1021 atoms.
Answer: 0.00546(5) or 5.47 x 10^-3 (don't forget sig figs)
Explanation: A mole of He is 6.02 x 10^23 atoms. To the answer, you'll need to divide 3.28 x 10^21 by 6.20 x 10^23.
how many milligrams of gas are formed if 10.0ml of 3.00% hydrogen eroxide solution decomposes? the density of the solution is 1.00 g/ml.
The milligrams of the gas are formed if 10.0ml of 3.00% hydrogen peroxide solution decomposes, The density of the solution is 1.00 g/mL is 300 mg.
The equation is as follows :
2H₂O₂(l) ----> 2H₂O(l) + O₂(g)
The density of the solution = 1 g/mL
The volume of the water = 100 mL
The volume of the H₂O₂ = 10 mL
The mass of the hydrogen peroxide = 3 g
2 moles of the hydrogen peroxide produces the 1 mole of the oxygen gas.
The mass of the O₂ = (10 mL × 3 g of H₂O₂ ) / 100 mL
= 0.3 g = 300 mg
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A student carefully measures a certain quantity of four different substances
into trays that will be used in a laboratory exercise. Which of these trays would
contain the largest number of atoms?
Sample
Mass of tray with sample
Water
Mass of empty tray
The substance with the most atoms per mole also has the most moles per mole. The Avogadro's number can be used to determine a substance's atom count.
How can I determine how many atoms are present in 1 mole of a compound?12 grams of pure carbon-12 weigh exactly one mole, or 6.022 x 1023 atoms, making one mole equivalent to 12 grams of pure carbon-12. • Avogadro's Number is the quantity of particles included in one mole (6.0221421 x 1023).
This figure indicates how many atoms, molecules, and ions make up one mole of a given chemical. All you have to do is determine which chemical contains the most moles. This substance will also contain the most atoms overall.
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What is the molecular formula of a compound that has a molecular weight of 240. 0 grams?. A 5. 00-gram sample contains 2. 00 grams of carbon, 0. 34 grams of hydrogen, and 2. 69 grams of oxygen
The molecular formula of the compound is C₂H₂O.
The molecular formula of a compound can be determined by finding the ratio of the moles of each element in the compound, and then using that ratio to write the formula.
The number of moles of carbon can be found by dividing the mass of carbon by its molar mass:
n_C = 2.00 g / (12.01 g/mol) = 0.166 mol
The number of moles of hydrogen can be found by dividing the mass of hydrogen by its molar mass:
n_H = 0.34 g / (1.01 g/mol) = 0.338 mol
The number of moles of oxygen can be found by dividing the mass of oxygen by its molar mass:
n_O = 2.69 g / (16.00 g/mol) = 0.168 mol
Next, we need to find the ratio of moles of each element in the compound. To do this, we divide the number of moles of each element by the total number of moles:
n_C / (n_C + n_H + n_O) = 0.166 / (0.166 + 0.338 + 0.168) = 0.166 / 0.672 = 0.246
n_H / (n_C + n_H + n_O) = 0.338 / (0.166 + 0.338 + 0.168) = 0.338 / 0.672 = 0.500
n_O / (n_C + n_H + n_O) = 0.168 / (0.166 + 0.338 + 0.168) = 0.168 / 0.672 = 0.250
We use these ratios to write the molecular formula:
C_x H_y O_z where x = 0.246, y = 0.500, and z = 0.250
The molecular formula of the compound is then obtained by multiplying each ratio by the smallest whole number that results in integers for x, y, and z:
C_x H_y O_z = C_(0.246 × 2) H_(0.500 × 2) O_(0.250 × 2) = C_0.492 H_1.000 O_0.500
Therefore, the molecular formula of the compound is C₂H₂O.
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a 29.3 ml sample of a 1.4 m potassium chloride solution is mixed with 36.8 ml of a 1.06 m lead(ii) nitrate solution and a precipitate forms. the solid is collected, dried, and found to have a mass of 2.00 g. what is the percent yield? enter to 2 decimal places
A precipitate occurs when a 29.3 ml sample of a 1.4 m potassium chloride solution and a 36.8 ml sample of a 1.06 m lead(ii) nitrate solution are combined. The solid is gathered, dried, and determined to weigh 2.00 g. 36.70% is the percent yield.
To calculate the percent yield of the reaction, we need to compare the actual yield with the theoretical yield, and express the result as a percentage.
According to the balanced equation, 2 moles of KCl react with 1 mole of Pb(NO3)2 to produce 1 mole of PbCl2. Therefore, the theoretical yield of PbCl2 is:0.0196 mol.
The molar mass of PbCl2 is 278.10 g/mol, so the theoretical mass of PbCl2 is:5.454
The actual yield of PbCl2 is given as 2.00 g. Therefore, the percent yield is:
percent yield = actual yield / theoretical yield x 100% = 2.00 g / 5.454 g x 100% = 36.70%
Rounding to two decimal places, the percent yield is 36.70%.
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Practice 55
Which hydrate contains the greatest
percent of water by mass?
1) LiCl H₂O
2) CaCl₂ 2H₂O
3) CuSO4 5H₂O
4) FeBr3 6H₂O
CaCl₂ 2H₂O contains the greatest percent of water by mass By halving the hydrate's formula , one may compute the theoretical (real) percent hydration.
What does it mean to hydrate?To provide with enough liquid or moisture; to make to occupy or mix with water or indeed the constituents of water. softens and moisturizes the skin. the intransitive verb "to hydrate"
What is a better hydrator than water?Milk is one of finest liquids for hydration, according to research, even more than water or caloric beverages. Researchers attribute milk's efficiency to its protein, carbs, and natural electrolytes.
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