Chem11 - Gas Laws

The absolute temperature of a gas is increased four times while maintaining a constant volume. What happens to the pressure of the gas?

It increases by a factor of 4

A mixture of H2 and water vapor is present in a closed vessel at 20°C. The total pressure of the system is 755.0 mmHg. Partial pressure of water vapor at 20°C equals 17.5 mmHg. What is the partial pressure of H2?

737.5 mmHg

A gas at 300 K and 4.0 atm is moved to a new location with a temperature of 250 K. The volume changes from 5.5 L to 2.0 L. What is the pressure of the gas at the new location?

9.2 atm

Which law states that the pressure and absolute temperature of a fixed quantity of gas are directly proportional under constant volume conditions?

Charles' Law

How will the volume of a gas be affected if the pressure is tripled, but the temperature remains the same?

It decreased by 1/3 of the total volume

What is the partial pressure of 0.50 mol Ne gas combined with 1.20 mol Kr gas at a final pressure of 730 torr?

215 torr

A balloon that had a volume of 3.50 L at 25.0°C is placed in a hot room at 40.0°C. If the pressure remains constant at 1.00 atm, what is the new volume of the balloon in the hot room?

3.68 L

Five gases combined in a gas cylinder have the following partial pressures: 3.00 atm (N2), 1.80 atm (O2), 0.29 atm (Ar), 0.18 atm (He), and 0.10 atm (H). What is the total pressure that is exerted by the gases? Use Pt = P1 + P2 + P3 ... + Pn

5.37 atm

A and B are two gases that are mixed together; 2.50 mol A is mixed with 0.85 mol B. If the final pressure of the mixture is 1.75 atm, what are the partial pressures of A and B?

1.3 atm partial pressure A .44 atm partial pressure B

An automobile tire at 30°C has a pressure of 3.00 atm. Temperature decreases to -5°C. Assume that there is no volume change in the tire. How does the tire pressure change in response to the temperature change? What is the new pressure of the tire after the temperature change?

It decreases to 2.65 atm

Four gases were combined in a gas cylinder with these partial pressures: 3.5 atm N2, 2.8 atm O2, 0.25 atm Ar, and 0.15 atm He. a). What is the total pressure inside the cylinder? b). What is the mole fraction of N2 in the mixture? c). What is the mole fraction of O2 in the mixture? d). What is the mole fraction of Ar in the mixture?

a). 6.7 atm b). 0.52 atm c). 0.42 atm d). 0.037 atm

Match one graph shown at right to each of the gas laws named below. a) Boyles law b). Charles law c). Gay-Lussac law

a). Inverse nonlinear volume on x-axis, pressure on y-axis b). Direct linear with temp on x-axis, volume on y-axis c). Direct linear with temp on x-axis, pressure on y-axis

Suppose that 0.25 mole of gas C was added to the mixture without changing the total pressure of the mixture . a). How does the addition of C to the mixture change the mole fraction of gas A? b). How does the addition of C to the mixture change the partial pressure of gas A? c). What is the partial pressure of C?

a). decreases b). decreases c). 0.12 atm

Assume that temperature and number of moles of gas are constant in this problem. Use the graph to complete the statement below. This graph shows that pressure and volume have...

an inverse nonlinear relationship

Why might a rubber raft burst if it is left in the sun on a summer day?

Temp increases, pressure in raft increases

Hikers have noticed that a sealed bag of potato chips puffs up when taken to the top of a mountain. Suppose that at the valley floor below, the air pressure is 1.0 atm, temperature is 25°C, and the volume of the chip bag is 0.985 L. At the top of the mountain, the temperature is 22°C and the chip bag has puffed up to 1.030 L. What is the air pressure on top of the mountain?

0.95 atm

A balloon with a volume of 2.0 L at 25°C is placed in a hot room at 35°C. The pressure on the balloon is constant at 1.0 atm. How does the volume of the balloon change after moving it to the hot room? What is the final volume of the balloon after it has been placed in the hot room?

Final volume increases to 2.1 liters.

Which law is described by saying that doubling the absolute temperature will double the pressure of a sample of gas in a rigid container?

Gay-Lussac's law

An air bubble with a volume of 5.0 mL is released at the bottom of a lake where the pressure is 3.0 atm. When it reaches the surface, the bubble experiences a pressure of 1.0 atm. How will the volume of the air bubble change? What is the volume of the air bubble when it reaches the surface?

It will increase; volume of bubble at surface is 15.0 ml

If you decreased the volume of a sample of gas by a factor of three while maintaining a constant pressure, how would the absolute temperature of the gas be affected?

It would decrease threefold.

A scientist is measuring the pressure that is exerted by each of the following gases in the atmosphere: carbon dioxide, oxygen, and nitrogen. Which term most likely describes what she is measuring?

Partial pressure