Question 1

Convert 705 torr to atm.

Accepted Answer

A)  7.01 x 107 atm
B)  0.705 atm
C)  0.928 atm
D)  1.08 atm
E)  5.36 x 105 atm

Question 2

A sample of CO2 is collected over water at 23 °\degree° C.If the total pressure of the sample is 734 torr, what is the partial pressure of the CO2? The vapor pressure of water at 23 °\degree° C is 21.2 torr.

Accepted Answer

A)  734 torr
B)  755 torr
C)  713 torr
D)  34.6 torr
E)  not enough information

Question 3

Rank the following substances in order of increasing average velocity, assuming they are all at the same temperature: N2, CH4, Ne, Kr

Accepted Answer

A)  N2 4 
B)  CH4 2 
C)  Kr 2 4 
D)  Ne 4 2 
E)  Ne 2 4

Question 4

If equal amounts of helium and argon are placed in a porous balloon, the argon will escape faster.

Accepted Answer

A) True 
 B)False

Question 5

Which of the following statements related to kinetic-molecular theory of gases is correct for an ideal gas?

Accepted Answer

A)  There are no attractive or repulsive forces between and among gas particles.
B)  Gas particles move slowly in a chaotic pattern until they collide with something.
C)  For a given amount of gas, the smaller the volume of the container, the fewer the collisions that occur with the container walls, since there is less surface area.
D)  The density of a gas is somewhat lower than that of a liquid.
E)  The more gas particles there are in a container, the more frequently they collide with one another, so the particles stick together, resulting in a lower pressure.

Question 6

The ideal gas law is a combination of several other gas laws which deal with fewer variables.

Accepted Answer

A) True 
 B)False

Question 7

The two balloons shown in the figure each have the same volume, temperature, and pressure.Which of the following statements regarding the two balloons is correct? 2 balloon has fewer molecules than the O2 balloon. B) The density of the O2 balloon is greater than the density of the CO2 balloon. C) The mass of the O2 balloon is greater than the mass of the CO2 balloon. D) The CO2 balloon is more buoyant than the O2 balloon. E) None of these statements is correct." class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  The CO2 balloon has fewer molecules than the O2 balloon.
B)  The density of the O2 balloon is greater than the density of the CO2 balloon.
C)  The mass of the O2 balloon is greater than the mass of the CO2 balloon.
D)  The CO2 balloon is more buoyant than the O2 balloon.
E)  None of these statements is correct.

Question 8

The "Before" image in the figure shows the initial condition of a gas at a certain temperature in a container with a movable piston.Which of the images represents the condition of the gas when the temperature of the gas is increased, and the external pressure is held constant?

Accepted Answer

A)  image I
B)  image II
C)  image III
D)  image IV
E)  None of the images

Question 9

A sample of gas initially occupies 5.50 L at a pressure of 0.750 atm at 13.0oC.What will the pressure be if the temperature is changed to 22.5oC, and the volume is changed to 1.50 L?

Accepted Answer

A)  6.39 atm
B)  11.4 atm
C)  0.211 atm
D)  2.84 atm
E)  1.59 atm

Question 10

Calculate the number of moles in 75.0 g of O2, and the pressure that it would exert at 80.0  °\degree° C in a 5.00 L steel tank.

Accepted Answer

A)  4.69 mol, 6.18 atm
B)  4.69 mol, 27.2 atm
C)  2.34 mol, 13.6 atm
D)  2.34 mol, 3.09 atm
E)  9.38 mol, 27.2 atm

Question 11

Calculate the number of moles in 75 g of O2, and the volume that it would occupy at STP.

Accepted Answer

A)  2.3 mol, 52 L
B)  2.3 mol, 0.10 L
C)  2.4 x 103 mol, 107 L
D)  2.4 x 103 mol, 5.4 x 104 L
E)  4.7 mol, 52 L

Question 12

Calculate the molar mass of a gas that has a density of 1.250 g/L at STP.

Accepted Answer

A)  11.42 g/mol
B)  12.50 g/mol
C)  28.02 g/mol
D)  0.05577 g/mol
E)  0.8000 g/mol

Question 13

Calculate the molar mass of a gas that has a density of 1.428 g/L at STP.

Accepted Answer

A)  15.70 g/mol
B)  14.28 g/mol
C)  0.4460 g/mol
D)  32.01 g/mol
E)  0.7002 g/mol

Question 14

Which physical characteristic does not apply to a gas?

Accepted Answer

A)  It can be compressed.
B)  Its molecules are separated by large distances.
C)  It occupies the total volume of its container.
D)  It has a high density.
E)  It can be formed by the evaporation of its liquid state.

Question 15

Calculate the number of moles and the mass of He gas present in a 2.00 L steel container if the pressure is 6.50 atm, and the temperature is 42.0  °\degree° C.

Accepted Answer

A)  1.00 mol, 4.00 g
B)  0.503 mol, 2.01 g
C)  3.77 mol, 15.1 g
D)  4.99 x 104 mol, 1.25 x 104 g
E)  6.65 x 103 mol, 2.66 x 105 g

Question 16

Which characteristic does not describe an ideal gas?

Accepted Answer

A)  negligible volume occupied by ideal gas molecules
B)  no attractive forces between ideal gas molecules
C)  obeys the equation PV = nRT
D)  PV/RT = a constant
E)  strong repulsions between molecules

Question 17

Propane burns in air according to the equation: C3H8(g)  + 5O2(g)   →\rightarrow→ 3CO2(g)  + 4H2O(g)  What volume of O2 would be required if 8.00 L of propane burns, assuming that all of the gases are under the same conditions?

Accepted Answer

A)  8.00 L
B)  40.0 L
C)  20.0 L
D)  15.0 L
E)  1.60 L

Question 18

If the temperature of a gas at a constant pressure is increased, the volume will

Accepted Answer

A)  become smaller because of fewer collisions with the sides of the container.
B)  become larger because of fewer collisions with the sides of the container.
C)  become smaller because of more collisions with the sides of the container.
D)  become larger because of more collisions with the sides of the container.
E)  stay the same because temperature has no effect on pressure.

Question 19

Which of the following gases will have a density of 2.104 g/L at 303 K and 1.31 atm?

Accepted Answer

A)  He
B)  Ne
C)  Ar
D)  Kr
E)  Xe

Question 20

The figure shows two balloons.They are at the same temperature and pressure, and contain equal volumes of gas, but one is floating, and the other is not.The reason for this behavior is that:

Accepted Answer

A)  the balloon that is not floating has the molecules more closely spaced than the other.
B)  the balloon that is not floating has a gas with a higher molar mass than that of air.
C)  the balloon that is floating has molecules with more kinetic energy.
D)  the balloon that is not floating has molecules that have slowed down, since it was filled before the floating balloon.
E)  the balloon that is floating has a more dense gas than the one that is not floating, so it holds up the balloon better.

Exam 9: The Gaseous State

A sample of gas initially occupies 5.50 L at a pressure of 0.750 atm at 13.0oC.What will the pressure be if the temperature is changed to 22.5oC, and the volume is changed to 1.50 L?

Correct AnswerverifiedShow Answer

If equal amounts of helium and argon are placed in a porous balloon, the argon will escape faster.

Correct AnswerverifiedShow Answer

Calculate the number of moles in 75.0 g of O2, and the pressure that it would exert at 80.0 °\degree° C in a 5.00 L steel tank.

Correct AnswerverifiedShow Answer

Which characteristic does not describe an ideal gas?

Correct AnswerverifiedShow Answer

Which of the following statements related to kinetic-molecular theory of gases is correct for an ideal gas?

Correct AnswerverifiedShow Answer

The "Before" image in the figure shows the initial condition of a gas at a certain temperature in a container with a movable piston.Which of the images represents the condition of the gas when the temperature of the gas is increased, and the external pressure is held constant?

Correct AnswerverifiedShow Answer

The ideal gas law is a combination of several other gas laws which deal with fewer variables.

Correct AnswerverifiedShow Answer

The two balloons shown in the figure each have the same volume, temperature, and pressure.Which of the following statements regarding the two balloons is correct?

Correct AnswerverifiedShow Answer

Calculate the number of moles and the mass of He gas present in a 2.00 L steel container if the pressure is 6.50 atm, and the temperature is 42.0 °\degree° C.

Correct AnswerverifiedShow Answer

Which of the following gases will have a density of 2.104 g/L at 303 K and 1.31 atm?

Correct AnswerverifiedShow Answer

If the temperature of a gas at a constant pressure is increased, the volume will

Correct AnswerverifiedShow Answer

A sample of CO2 is collected over water at 23 °\degree° C.If the total pressure of the sample is 734 torr, what is the partial pressure of the CO2? The vapor pressure of water at 23 °\degree° C is 21.2 torr.

Correct AnswerverifiedShow Answer

Calculate the molar mass of a gas that has a density of 1.428 g/L at STP.

Correct AnswerverifiedShow Answer

Calculate the molar mass of a gas that has a density of 1.250 g/L at STP.

Correct AnswerverifiedShow Answer

The figure shows two balloons.They are at the same temperature and pressure, and contain equal volumes of gas, but one is floating, and the other is not.The reason for this behavior is that:

Correct AnswerverifiedShow Answer

Calculate the number of moles in 75 g of O2, and the volume that it would occupy at STP.

Correct AnswerverifiedShow Answer

Which physical characteristic does not apply to a gas?

Correct AnswerverifiedShow Answer

Rank the following substances in order of increasing average velocity, assuming they are all at the same temperature: N2, CH4, Ne, Kr

Correct AnswerverifiedShow Answer

Propane burns in air according to the equation: C3H8(g) + 5O2(g) →\rightarrow→ 3CO2(g) + 4H2O(g) What volume of O2 would be required if 8.00 L of propane burns, assuming that all of the gases are under the same conditions?

Correct AnswerverifiedShow Answer

Convert 705 torr to atm.

Correct AnswerverifiedShow Answer

A sample of gas initially occupies 5.50 L at a pressure of 0.750 atm at 13.0^oC.What will the pressure be if the temperature is changed to 22.5^oC, and the volume is changed to 1.50 L?

Correct Answer
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Correct Answer
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Calculate the number of moles in 75.0 g of O₂, and the pressure that it would exert at 80.0 $\degree$ C in a 5.00 L steel tank.

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Calculate the number of moles and the mass of He gas present in a 2.00 L steel container if the pressure is 6.50 atm, and the temperature is 42.0 $\degree$ C.

Correct Answer
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Correct Answer
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Correct Answer
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A sample of CO₂ is collected over water at 23 $\degree$ C.If the total pressure of the sample is 734 torr, what is the partial pressure of the CO₂? The vapor pressure of water at 23 $\degree$ C is 21.2 torr.

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Calculate the number of moles in 75 g of O₂, and the volume that it would occupy at STP.

Correct Answer
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Correct Answer
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Rank the following substances in order of increasing average velocity, assuming they are all at the same temperature: N₂, CH₄, Ne, Kr

Correct Answer
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Propane burns in air according to the equation: C₃H₈(g) + 5O₂(g) $\rightarrow$ 3CO₂(g) + 4H₂O(g) What volume of O₂would be required if 8.00 L of propane burns, assuming that all of the gases are under the same conditions?

Correct Answer
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Correct Answer
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