Question 1

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?

Accepted Answer

A)   5.38 L
B)   10.9 L
C)   19.0 L
D)   38.3 L
E)   77.9 LF) All of the above
G) C) and D)

Question 2

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

Accepted Answer

A)   0.0176 g/L
B)   0.0250 g/L
C)   0.0561 g/L
D)   1.78 g/L
E)   181. g/LF) A) and B)
G) B) and D)

Question 3

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.

Accepted Answer

A)   2520 J/mol
B)   4150 J/mol
C)   5920 J/mol
D)   9330 J/mol
E)   5920 kJ/molF) A) and B)
G) C) and D)

Question 4

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

Accepted Answer

A) True 
 B)False

Question 5

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?

Accepted Answer

A)   8.5 h
B)   12 h
C)   48 h
D)   60. h
E)   68 hF) A) and D)
G) A) and E)

Question 6

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?

Accepted Answer

The answer of Which of the lines on the figure...

Question 7

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?

Accepted Answer

A)   21.8 L
B)   27.6 L
C)   29.6 L
D)   37.6 L
E)   153 LF) C) and D)
G) D) and E)

Question 8

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.

Accepted Answer

A)   95.0°C
B)   85.1°C
C)   77.2°C
D)   72.9°C
E)   65.2°CF) A) and D)
G) A) and C)

Question 9

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?

Accepted Answer

A)   37.5 K
B)   75 K
C)   106 K
D)   292 K
E)   2400. KF) B) and D)
G) A) and B)

Question 10

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

Accepted Answer

A) True 
 B)False

Question 11

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

Accepted Answer

At STP, the pressure...

Question 12

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

Accepted Answer

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

Question 13

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?

Accepted Answer

A)   1 Pa = 1000 g/cms2
B)   1 Pa = 1 g/ms2
C)   1 Pa = 10-3 kgm/s2
D)   1 Pa = 1 kgm/s2
E)   1 Pa = 1 kg/ms2F) B) and D)
G) B) and C)

Question 14

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?

Accepted Answer

A)   5.2 × 10-7
B)   4.5 × 10-5
C)   5.2 × 10-4
D)   5.2 × 10-1
E)   none of the aboveF) C) and D)
G) B) and E)

Question 15

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?

Accepted Answer

A)   0.271 mol
B)   2.27 mol
C)   3.69 mol
D)   206 mol
E)   227 molF) C) and D)
G) B) and E)

Question 16

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.

Accepted Answer

a. 3.11 L
...

Question 17

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?

Accepted Answer

A)   25.2 L
B)   30.6 L
C)   33.6 L
D)   37.1 L
E)   49.2 LF) None of the above
G) C) and D)

Question 18

"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.

Accepted Answer

A)   Charles's
B)   Boyle's
C)   Amontons's
D)   Avogadro's
E)   Dalton'sF) A) and D)
G) A) and C)

Question 19

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

Accepted Answer

A) True 
 B)False

Question 20

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)

Accepted Answer

A)   687 mL
B)   819 mL
C)   687 L
D)   819 L
E)   22.4 LF) B) and C)
G) C) and D)

Exam 5: Gases and the Kinetic-Molecular Theory

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?

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

"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.

Correct AnswerverifiedShow Answer

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.

Correct Answerverifieda. 3.11 L...View AnswerShow Answer

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

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

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)

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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.

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

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.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedAt STP, the pressure...View AnswerShow Answer

Correct Answer
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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?

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a. 3.11 L
...
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Calculate the root-mean-square speed of methane, CH₄(g) , at 78°C.

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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)

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At STP, the pressure...
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