Question 1

The molecules of different samples of an ideal gas have the same average kinetic energies at the same ________.

Accepted Answer

A)  pressure
B)  temperature
C)  volume
D)  densityE) B) and D)
F) C) and D)

Question 2

Which of the following is/are characteristic(s) of gases?

Accepted Answer

A)  High compressibility
B)  Relatively large distances between molecules
C)  Formation of homogeneous mixtures regardless of the nature of gases
D)  Choice 1 and 2 only
E)  Choice 1,2,and 3F) All of the above
G) A) and C)

Question 3

What is the formula which describes the relationship between the pressure and volume at constant temperature and constant number of moles?

Accepted Answer

A)  PV = k1
B)  V/P = k1
C)  P/V = k1
D)  k1P = V
E)  P = -k1VF) A) and B)
G) A) and C)

Question 4

What is the density of carbon dioxide gas at -25.2°C and 98.0 kPa? (R = 0.08206 L • atm/K • mol,1 atm = 101,325 Pa)

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 B)
G) C) and D)

Question 5

In the van der Waals equation,the constant b is a constant that is part of a correction factor for _________.

Accepted Answer

A)  the volume of the gas
B)  the temperature of the gas
C)  the pressure of the gas
D)  the ideal gas constantE) A) and B)
F) None of the above

Question 6

What is the density of CO2(g) at 100.°C and 10.0 atm pressure? (R = 0.08206 L • atm/K • mol)

Accepted Answer

A)  1.44 g/L
B)  134 g/L
C)  44.0 g/L
D)  53.6 g/L
E)  14.4 g/LF) A) and C)
G) A) and E) E

Question 7

Freon-12,CF2Cl2,which has been widely used in air conditioning systems,is considered a threat to the ozone layer in the stratosphere.Calculate the root-mean-square velocity of Freon-12 molecules in the lower stratosphere where the temperature is -65°C.

Accepted Answer

A)  20 m/s
B)  120 m/s
C)  207 m/s
D)  260 m/s
E)  4.4 × 104 m/sF) B) and C)
G) None of the above

Question 8

In the van der Waals equation,the constant a is a constant that is part of a correction factor for _________.

Accepted Answer

A)  the volume of the gas
B)  the temperature of the gas
C)  the pressure of the gas
D)  the ideal gas constantE) All of the above
F) A) and B)

Question 9

A sample of nitrogen gas has the temperature drop from 250.°C to 150.°C at constant pressure. What is the final volume if the initial volume is 310.mL?

Accepted Answer

A)  0.186 L
B)  0.251 L
C)  0.383 L
D)  0.410 L
E)  0.517 LF) B) and E)
G) A) and E)

Question 10

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? (R = 0.08206 L • atm/K • mol,1 atm = 760 torr)

Accepted Answer

A)  0.272 mol
B)  2.27 mol
C)  3.69 mol
D)  206 mol
E)  227 molF) None of the above
G) A) and E)

Question 11

Which of the following gas molecules have the highest average kinetic energy at 25°C?

Accepted Answer

A)  H2
B)  O2
C)  N2
D)  Cl2
E)  All the gases have the same average kinetic energy.F) A) and E)
G) B) and D)

Question 12

A gas sample occupies 8.76 L at a temperature of 37°C.What is the volume if the temperature is lowered to 0°C at constant pressure?

Accepted Answer

A)  9.95 L
B)  0 L
C)  4.22 L
D)  74.1 L
E)  7.71 LF) A) and D)
G) A) and C)

Question 13

What is the pressure in atmospheres exerted by a column of water that is 12.5 m high? (density of water = 1.00g/cm3; gravitational constant = 9.80665 m/s2,1 atm = 101,325 Pa = 760 torr = 760 mmHg)

Accepted Answer

A)  123 atm
B)  1.23 × 105 atm
C)  0.785 atm
D)  1.21 atm
E)  1.23 × 10-3 atmF) B) and E)
G) A) and D)

Question 14

At what temperature is the root mean square speed of helium gas equal to that of oxygen gas at 300.K?

Accepted Answer

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

Question 15

Calculate the volume of H2(g) at 273 K and 2.00 atm that will be formed when 275 mL of 0.725 M HCl solution reacts with 50.0 g Zn(s) to give hydrogen gas and aqueous zinc chloride.
(R = 0.08206 L • atm/K • mol)

Accepted Answer

A)  0.56 L
B)  1.12 L
C)  2.23 L
D)  4.47 L
E)  3.54 LF) B) and E)
G) B) and D)

Question 16

Which of the following gases effuses most rapidly?

Accepted Answer

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

Question 17

Which represents the definition of pressure?

Accepted Answer

A)  volume/density
B)  temperature × area
C)  moles/volume
D)  force/area
E)  volume × forceF) A) and E)
G) C) and D) D

Question 18

If 2.3 mol of a gas occupies 50.5 mL,how many moles of the gas will occupy 85.5 mL at the same temperature and pressure?

Accepted Answer

A)  1.4 mol
B)  0.59 mol
C)  3.9 mol
D)  0.26 mol
E)  2.3 molF) B) and C)
G) C) and D)

Question 19

Which sample of gas is least likely to behave ideally?

Accepted Answer

A)  1 mol He(g) at 400 K,1 atm pressure
B)  1 mol Ne(g) at 400 K,1 atm pressure
C)  1 mol H2(g) at 400 K,1 atm pressure
D)  1 mol O2(g) at 400 K,1 atm pressure
E)  1 mol H2O(g) at 400 K,1 atm pressureF) C) and E)
G) None of the above

Question 20

A sample of an ideal gas has its volume doubled while its temperature remains constant.If the original pressure was 100 torr,what is the new pressure?

Accepted Answer

A)  10 torr
B)  50 torr
C)  100 torr
D)  200 torr
E)  1000 torrF) A) and E)
G) A) and D)

Exam 10: Gases

The molecules of different samples of an ideal gas have the same average kinetic energies at the same ________.

Correct AnswerverifiedShow Answer

Which of the following is/are characteristic(s) of gases?

Correct AnswerverifiedShow Answer

What is the formula which describes the relationship between the pressure and volume at constant temperature and constant number of moles?

Correct AnswerverifiedShow Answer

What is the density of carbon dioxide gas at -25.2°C and 98.0 kPa? (R = 0.08206 L • atm/K • mol,1 atm = 101,325 Pa)

Correct AnswerverifiedShow Answer

In the van der Waals equation,the constant b is a constant that is part of a correction factor for _________.

Correct AnswerverifiedShow Answer

What is the density of CO2(g) at 100.°C and 10.0 atm pressure? (R = 0.08206 L • atm/K • mol)

Correct AnswerverifiedE

Freon-12,CF2Cl2,which has been widely used in air conditioning systems,is considered a threat to the ozone layer in the stratosphere.Calculate the root-mean-square velocity of Freon-12 molecules in the lower stratosphere where the temperature is -65°C.

Correct AnswerverifiedShow Answer

In the van der Waals equation,the constant a is a constant that is part of a correction factor for _________.

Correct AnswerverifiedShow Answer

A sample of nitrogen gas has the temperature drop from 250.°C to 150.°C at constant pressure. What is the final volume if the initial volume is 310.mL?

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? (R = 0.08206 L • atm/K • mol,1 atm = 760 torr)

Correct AnswerverifiedShow Answer

Which of the following gas molecules have the highest average kinetic energy at 25°C?

Correct AnswerverifiedShow Answer

A gas sample occupies 8.76 L at a temperature of 37°C.What is the volume if the temperature is lowered to 0°C at constant pressure?

Correct AnswerverifiedShow Answer

What is the pressure in atmospheres exerted by a column of water that is 12.5 m high? (density of water = 1.00g/cm3; gravitational constant = 9.80665 m/s2,1 atm = 101,325 Pa = 760 torr = 760 mmHg)

Correct AnswerverifiedShow Answer

At what temperature is the root mean square speed of helium gas equal to that of oxygen gas at 300.K?

Correct AnswerverifiedA

Calculate the volume of H2(g) at 273 K and 2.00 atm that will be formed when 275 mL of 0.725 M HCl solution reacts with 50.0 g Zn(s) to give hydrogen gas and aqueous zinc chloride. (R = 0.08206 L • atm/K • mol)

Correct AnswerverifiedShow Answer

Which of the following gases effuses most rapidly?

Correct AnswerverifiedShow Answer

Which represents the definition of pressure?

Correct AnswerverifiedD

If 2.3 mol of a gas occupies 50.5 mL,how many moles of the gas will occupy 85.5 mL at the same temperature and pressure?

Correct AnswerverifiedShow Answer

Which sample of gas is least likely to behave ideally?

Correct AnswerverifiedShow Answer

A sample of an ideal gas has its volume doubled while its temperature remains constant.If the original pressure was 100 torr,what is the new pressure?

Correct AnswerverifiedShow Answer

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What is the density of CO₂(g) at 100.°C and 10.0 atm pressure? (R = 0.08206 L • atm/K • mol)

Correct Answer
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E

Freon-12,CF₂Cl₂,which has been widely used in air conditioning systems,is considered a threat to the ozone layer in the stratosphere.Calculate the root-mean-square velocity of Freon-12 molecules in the lower stratosphere where the temperature is -65°C.

Correct Answer
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Correct Answer
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What is the pressure in atmospheres exerted by a column of water that is 12.5 m high? (density of water = 1.00g/cm³; gravitational constant = 9.80665 m/s²,1 atm = 101,325 Pa = 760 torr = 760 mmHg)

Correct Answer
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Correct Answer
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A

Calculate the volume of H₂(g) at 273 K and 2.00 atm that will be formed when 275 mL of 0.725 M HCl solution reacts with 50.0 g Zn(s) to give hydrogen gas and aqueous zinc chloride. (R = 0.08206 L • atm/K • mol)

Correct Answer
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Correct Answer
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D

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