Question 1

A sample of oxygen gas has its absolute temperature halved while the pressure of the gas remained constant.If the initial volume is 400 mL,what is the final volume?

Accepted Answer

A)  20 mL
B)  133 mL
C)  200 mL
D)  400 mL
E)  800 mLF) A) and D)
G) B) and E)

Question 2

A 750-mL sample of hydrogen exerts a pressure of 822 torr at 325 K.What pressure does it exert if the temperature is raised to 475 K at constant volume?

Accepted Answer

A)  188 torr
B)  562 torr
C)  1.11  ×	imes×  103 torr
D)  1.20  ×	imes×  103 torr
E)  1.90  ×	imes×  103 torr F) None of the above
G) A) and E)

Question 3

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) A) and B)
G) B) and E)

Question 4

Small quantities of hydrogen can be prepared by the addition of hydrochloric acid to zinc.A sample of 195 mL of hydrogen was collected over water at 25°C and 753 torr.What mass of hydrogen was collected? (Pwater = 24 torr at 25°C)

Accepted Answer

A)  0.00765 g
B)  0.0154 g
C)  0.0159 g
D)  0.0164 g
E)  0.159 gF) A) and D)
G) C) and D)

Question 5

A 1.30-L sample of argon gas is at 1.02 atm and 21.5°C.
a.What mass of argon is in the container?
b.If the temperature is raised to 500.0°C while the volume remains constant,calculate the new pressure,in atmospheres.

Accepted Answer

The answer of A 1.30-L sample of argon gas is...

Question 6

State Boyle's Law and illustrate it with a graph,using standard x-y coordinate axes.Be sure to label the axes unambiguously with the correct gas variables.

Accepted Answer

At constant temperature,the volume of a ...

Question 7

Which of the lines on the figure below is the best representation of the relationship between the volume of a gas and its Celsius temperature,other factors remaining constant?

Accepted Answer

A)  a
B)  b
C)  c
D)  d
E)  eF) B) and D)
G) A) and E)

Question 8

For real gases,PV > nRT,always.

Accepted Answer

A) True 
 B)False

Question 9

Which of the following gases effuses most rapidly?

Accepted Answer

A)  nitrogen
B)  oxygen
C)  hydrogen chloride
D)  ammonia
E)  carbon monoxideF) D) and E)
G) A) and B)

Question 10

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) C) and E)
G) All of the above

Question 11

"The total pressure in a mixture of unreacting gases is equal to the sum of the partial pressures of the individual gases" is a statement of __________________ Law.

Accepted Answer

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

Question 12

At very high pressures (~ 1000 atm) ,the measured pressure exerted by real gases is greater than that predicted by the ideal gas equation.This is mainly because

Accepted Answer

A)  such high pressures cannot be accurately measured.
B)  real gases will condense to form liquids at 1000 atm pressure.
C)  gas phase collisions prevent molecules from colliding with the walls of the container.
D)  of attractive intermolecular forces between gas molecules.
E)  the volume occupied by the gas molecules themselves becomes significant.F) C) and E)
G) B) and D)

Question 13

A sample of nitrogen gas at 298 K and 745 torr has a volume of 37.42 L.What volume will it occupy if the pressure is increased to 894 torr at constant temperature?

Accepted Answer

A)  22.3 L
B)  31.2 L
C)  44.9 L
D)  112 L
E)  380 LF) A) and E)
G) B) and D)

Question 14

Chlorofluorocarbons are important air pollutants implicated in global warming and ozone depletion.How fast does the chlorofluorocarbon CF2Cl2 diffuse relative to N2,the main component of the atmosphere? In other words,calculate the ratio of diffusion rates:

Accepted Answer

Question 15

Calculate the pressure of a helium sample at -207.3°C and 768 mL if it exerts a pressure of 175 kPa at 25.0°C and 925 mL.

Accepted Answer

A)  32.1 kPa
B)  46.6 kPa
C)  657 kPa
D)  953 kPa
E)  It is not possible,since the pressure would have to be negative.F) A) and E)
G) All of the above

Question 16

A 1.00-L sample of a pure gas weighs 0.785 g and is at 0.965 atm and 29.2°C.
a.What is the molar mass of the gas?
b.If the volume and temperature are kept constant while 0.400 g of the same gas are added to that already in the container,what will the new pressure be?

Accepted Answer

a.20.2 g/m...

Question 17

A 20.0-L container holds 15.3 mol of Cl2 gas at 227°C.
a.Calculate the pressure in atmospheres,assuming ideal behavior.
b.Calculate the pressure in atmospheres,assuming van der Waals behavior.The van der Waals constants for Cl2 are a = 6.49 atm·L2/mol2 and b = 0.0562 L/mol.

Accepted Answer

a.31.4 atm...

Question 18

Mineral oil can be used in place of mercury in certain pressure-measuring instruments when small pressure changes are to be measured.What is the pressure of an oxygen sample in mm of mineral oil if its pressure is 28.5 mm Hg? (d of mineral oil = 0.88 g/mL;d of Hg = 13.5 g/mL)

Accepted Answer

A)  1.9 mm mineral oil
B)  15 mm mineral oil
C)  32 mm mineral oil
D)  380 mm mineral oil
E)  440 mm mineral oilF) A) and D)
G) D) and E)

Question 19

A sample of ammonia gas at 65.5°C and 524 torr has a volume of 15.31 L.What is its volume when the temperature is -15.8°C and its pressure is 524 torr?

Accepted Answer

A)  3.69 L
B)  11.6 L
C)  20.2 L
D)  63.5 L
E)  It is not possible,since the volume would have to be negative.F) A) and C)
G) All of the above

Question 20

What is the density of carbon dioxide gas at -25.2°C and 98.0 kPa?

Accepted Answer

A)  0.232 g/L
B)  0.279 g/L
C)  0.994 g/L
D)  1.74 g/L
E)  2.09 g/LF) A) and E)
G) C) and D)

Exam 5: Gases and the Kinetic-Molecular Theory

A 1.30-L sample of argon gas is at 1.02 atm and 21.5°C. a.What mass of argon is in the container? b.If the temperature is raised to 500.0°C while the volume remains constant,calculate the new pressure,in atmospheres.

Correct AnswerverifiedShow Answer

A sample of oxygen gas has its absolute temperature halved while the pressure of the gas remained constant.If the initial volume is 400 mL,what is the final volume?

Correct AnswerverifiedShow Answer

What is the density of carbon dioxide gas at -25.2°C and 98.0 kPa?

Correct AnswerverifiedShow Answer

"The total pressure in a mixture of unreacting gases is equal to the sum of the partial pressures of the individual gases" is a statement of __________________ Law.

Correct AnswerverifiedShow Answer

A 750-mL sample of hydrogen exerts a pressure of 822 torr at 325 K.What pressure does it exert if the temperature is raised to 475 K at constant volume?

Correct AnswerverifiedShow Answer

Small quantities of hydrogen can be prepared by the addition of hydrochloric acid to zinc.A sample of 195 mL of hydrogen was collected over water at 25°C and 753 torr.What mass of hydrogen was collected? (Pwater = 24 torr at 25°C)

Correct AnswerverifiedShow Answer

For real gases,PV > nRT,always.

Correct AnswerverifiedShow Answer

A 20.0-L container holds 15.3 mol of Cl2 gas at 227°C. a.Calculate the pressure in atmospheres,assuming ideal behavior. b.Calculate the pressure in atmospheres,assuming van der Waals behavior.The van der Waals constants for Cl2 are a = 6.49 atm·L2/mol2 and b = 0.0562 L/mol.

Correct Answerverifieda.31.4 atm...View AnswerShow Answer

Which of the following gases effuses most rapidly?

Correct AnswerverifiedShow Answer

Mineral oil can be used in place of mercury in certain pressure-measuring instruments when small pressure changes are to be measured.What is the pressure of an oxygen sample in mm of mineral oil if its pressure is 28.5 mm Hg? (d of mineral oil = 0.88 g/mL;d of Hg = 13.5 g/mL)

Correct AnswerverifiedShow Answer

At very high pressures (~ 1000 atm) ,the measured pressure exerted by real gases is greater than that predicted by the ideal gas equation.This is mainly because

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

A sample of ammonia gas at 65.5°C and 524 torr has a volume of 15.31 L.What is its volume when the temperature is -15.8°C and its pressure is 524 torr?

Correct AnswerverifiedShow Answer

Which of the lines on the figure below is the best representation of the relationship between the volume of a gas and its Celsius temperature,other factors remaining constant?

Correct AnswerverifiedShow Answer

State Boyle's Law and illustrate it with a graph,using standard x-y coordinate axes.Be sure to label the axes unambiguously with the correct gas variables.

Correct AnswerverifiedAt constant temperature,the volume of a ...View AnswerShow Answer

Chlorofluorocarbons are important air pollutants implicated in global warming and ozone depletion.How fast does the chlorofluorocarbon CF2Cl2 diffuse relative to N2,the main component of the atmosphere? In other words,calculate the ratio of diffusion rates:

Correct AnswerverifiedShow Answer

A sample of nitrogen gas at 298 K and 745 torr has a volume of 37.42 L.What volume will it occupy if the pressure is increased to 894 torr at constant temperature?

Correct AnswerverifiedShow Answer

A 1.00-L sample of a pure gas weighs 0.785 g and is at 0.965 atm and 29.2°C. a.What is the molar mass of the gas? b.If the volume and temperature are kept constant while 0.400 g of the same gas are added to that already in the container,what will the new pressure be?

Correct Answerverifieda.20.2 g/m...View AnswerShow Answer

Calculate the pressure of a helium sample at -207.3°C and 768 mL if it exerts a pressure of 175 kPa at 25.0°C and 925 mL.

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

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Small quantities of hydrogen can be prepared by the addition of hydrochloric acid to zinc.A sample of 195 mL of hydrogen was collected over water at 25°C and 753 torr.What mass of hydrogen was collected? (P_water = 24 torr at 25°C)

Correct Answer
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Correct Answer
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A 20.0-L container holds 15.3 mol of Cl₂ gas at 227°C. a.Calculate the pressure in atmospheres,assuming ideal behavior. b.Calculate the pressure in atmospheres,assuming van der Waals behavior.The van der Waals constants for Cl₂ are a = 6.49 atm·L²/mol² and b = 0.0562 L/mol.

Correct Answer
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a.31.4 atm...
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At constant temperature,the volume of a ...
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Chlorofluorocarbons are important air pollutants implicated in global warming and ozone depletion.How fast does the chlorofluorocarbon CF₂Cl₂ diffuse relative to N₂,the main component of the atmosphere? In other words,calculate the ratio of diffusion rates:

Correct Answer
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Correct Answer
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Correct Answer
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a.20.2 g/m...
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Correct Answer
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