Calculate the root-mean-square speed of methane, CH4 (g), at 78°C.

A) 23 m/s B) 350 m/s C) 550 m/s D) 667 m/s E) 740 m/s A) 23 m/s B) 350 m/s C) 550 m/s D) 667 m/s E) 740 m/s

Exam 5: Gases and the Kinetic-Molecular Theory

The volume of a single molecule of water is 2.99 × 10^-23 mL. For a sample of gaseous water at 1.00 atm and 150 °C, what fraction of the container's volume is occupied by the molecules themselves?

(Multiple Choice)

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Question 81

The temperature of the carbon dioxide atmosphere near the surface of Venus is 475°C. Calculate the average kinetic energy per mole of carbon dioxide molecules on Venus.

(Multiple Choice)

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Question 82

Calculate the temperature of an argon sample at 55.4 kPa and 18.6 L if it occupies 25.8 L at 75.0°C and 41.1 kPa.

(Multiple Choice)

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Question 83

A 0.850-mole sample of nitrous oxide, a gas used as an anesthetic by dentists, has a volume of 20.46 L at 123°C and 1.35 atm. What would be its volume at 468°C and 1.35 atm?

(Multiple Choice)

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Question 84

A 3.0-L sample of helium was placed in a container fitted with a porous membrane. Half of the helium effused through the membrane in 24 hours. A 3.0-L sample of oxygen was placed in an identical container. How many hours will it take for half of the oxygen to effuse through the membrane?

(Multiple Choice)

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Question 85

Calculate the root-mean-square speed of methane, CH₄(g), at 78°C.

(Multiple Choice)

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Question 86

Which of the lines on the figure below is the best representation of the relationship between the volume and the number of moles of a gas, measured at constant temperature and pressure?

(Short Answer)

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Question 87

Lithium oxide is an effective absorber of carbon dioxide and can be used to purify air in confined areas such as space vehicles. What volume of carbon dioxide can be absorbed by 1.00 kg of lithium oxide at 25°C and 1.00 atm? Li₂O(aq) + CO₂(g)  Li₂CO₃(s)

(Multiple Choice)

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Question 88

A 3.60-L gas sample is at a pressure of 95.5 kPa and a temperature of 25.0°C. a. Calculate the volume occupied by the gas at STP, assuming it behaves ideally. b. If the gas sample weighs 6.10 g, calculate the molar mass of the gas.

(Essay)

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Question 89

According to the postulates of kinetic-molecular theory, the molecules of all gases at a given temperature have the same average speed.

(True/False)

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Question 90

At what temperature in kelvin is the root mean square speed of helium atoms (atomic weight = 4.00) equal to that of oxygen molecules (molecular weight = 32.00) at 300. K?

(Multiple Choice)

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Question 91

Nitrogen dioxide is a red-brown gas that is responsible for the color of photochemical smog. A sample of nitrogen dioxide has a volume of 28.6 L at 45.3°C and 89.9 kPa. What is its volume at STP?

(Multiple Choice)

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Question 92

A sample of propane, a component of LP gas, has a volume of 35.3 L at 315 K and 922 torr. What is its volume at STP?

(Multiple Choice)

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Question 93

"The volume of an ideal gas is directly proportional to its absolute temperature at constant pressure and number of moles" is a statement of ________________ Law.

(Multiple Choice)

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Question 94

Briefly state the conditions corresponding to STP (standard temperature and pressure).

(Essay)

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Question 95

At a temperature of absolute zero, the volume of an ideal gas is zero.

(True/False)

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Question 96

For a pure gas sample, the average kinetic energy is also the most probable kinetic energy.

(True/False)

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Question 97

A sample of nitrogen gas is confined to a 14.0 L container at 375 torr and 37.0°C. How many moles of nitrogen are in the container?

(Multiple Choice)

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Question 98

Assuming ideal behavior, what is the density of argon gas at STP, in g/L?

(Multiple Choice)

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Question 99

Given that pressure has dimensions of force ÷ area; that force has dimensions of mass × acceleration; and that the S.I. unit of pressure is the pascal, what is 1 pascal in terms of S.I. base units?

(Multiple Choice)

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Question 100

Showing 81 - 100 of 115

Exam 5: Gases and the Kinetic-Molecular Theory

The volume of a single molecule of water is 2.99 × 10-23 mL. For a sample of gaseous water at 1.00 atm and 150 °C, what fraction of the container's volume is occupied by the molecules themselves?

The temperature of the carbon dioxide atmosphere near the surface of Venus is 475°C. Calculate the average kinetic energy per mole of carbon dioxide molecules on Venus.

Calculate the temperature of an argon sample at 55.4 kPa and 18.6 L if it occupies 25.8 L at 75.0°C and 41.1 kPa.

A 0.850-mole sample of nitrous oxide, a gas used as an anesthetic by dentists, has a volume of 20.46 L at 123°C and 1.35 atm. What would be its volume at 468°C and 1.35 atm?

A 3.0-L sample of helium was placed in a container fitted with a porous membrane. Half of the helium effused through the membrane in 24 hours. A 3.0-L sample of oxygen was placed in an identical container. How many hours will it take for half of the oxygen to effuse through the membrane?

Calculate the root-mean-square speed of methane, CH4 (g), at 78°C.

Which of the lines on the figure below is the best representation of the relationship between the volume and the number of moles of a gas, measured at constant temperature and pressure?

Lithium oxide is an effective absorber of carbon dioxide and can be used to purify air in confined areas such as space vehicles. What volume of carbon dioxide can be absorbed by 1.00 kg of lithium oxide at 25°C and 1.00 atm? Li2O(aq) + CO2(g)  Li2CO3(s)

A 3.60-L gas sample is at a pressure of 95.5 kPa and a temperature of 25.0°C. a. Calculate the volume occupied by the gas at STP, assuming it behaves ideally. b. If the gas sample weighs 6.10 g, calculate the molar mass of the gas.

According to the postulates of kinetic-molecular theory, the molecules of all gases at a given temperature have the same average speed.

At what temperature in kelvin is the root mean square speed of helium atoms (atomic weight = 4.00) equal to that of oxygen molecules (molecular weight = 32.00) at 300. K?

Nitrogen dioxide is a red-brown gas that is responsible for the color of photochemical smog. A sample of nitrogen dioxide has a volume of 28.6 L at 45.3°C and 89.9 kPa. What is its volume at STP?

A sample of propane, a component of LP gas, has a volume of 35.3 L at 315 K and 922 torr. What is its volume at STP?

"The volume of an ideal gas is directly proportional to its absolute temperature at constant pressure and number of moles" is a statement of ________________ Law.

Briefly state the conditions corresponding to STP (standard temperature and pressure).

At a temperature of absolute zero, the volume of an ideal gas is zero.

For a pure gas sample, the average kinetic energy is also the most probable kinetic energy.

A sample of nitrogen gas is confined to a 14.0 L container at 375 torr and 37.0°C. How many moles of nitrogen are in the container?

Assuming ideal behavior, what is the density of argon gas at STP, in g/L?

Given that pressure has dimensions of force ÷ area; that force has dimensions of mass × acceleration; and that the S.I. unit of pressure is the pascal, what is 1 pascal in terms of S.I. base units?

Keys to the Study of Chemistry

The Components of Matter

Stoichiometry of Formulas and Equations

The Major Classes of Chemical Reactions

Thermochemistry: Energy Flow and Chemical Change

Quantum Theory and Atomic Structure

Electron Configuration and Chemical Periodicity

Models of Chemical Bonding

The Shapes of Molecules

Theories of Covalent Bonding

Intermolecular Forces: Liquids, Solids, and Phase Changes

The Properties of Mixtures: Solutions and Colloids

Periodic Patterns in the Main Group Elements: Bonding, Structure, and Reactivity

Organic Compounds and the Atomic Properties of Carbon

Kinetics: Rates and Mechanisms of Chemical Reactions

Equilibrium: the Extent of Chemical Reactions

Acid-Base Equilibria

Ionic Equilibria in Aqueous Systems

Thermodynamics: Entropy, Free Energy, and the Direction of Chemical Reactions

Electrochemistry: Chemical Change and Electrical Work

The Elements in Nature and Industry

The Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

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The volume of a single molecule of water is 2.99 × 10^-23 mL. For a sample of gaseous water at 1.00 atm and 150 °C, what fraction of the container's volume is occupied by the molecules themselves?

Calculate the root-mean-square speed of methane, CH₄(g), at 78°C.

Lithium oxide is an effective absorber of carbon dioxide and can be used to purify air in confined areas such as space vehicles. What volume of carbon dioxide can be absorbed by 1.00 kg of lithium oxide at 25°C and 1.00 atm? Li₂O(aq) + CO₂(g)  Li₂CO₃(s)