Gas Law Review

There are 40 liters of helium in a balloon at 100 K. If the temperature of the balloon is increased to 200 K, what will the new volume of the balloon be?

• 80 L
• 45 L
• 54 L
• 45.33 L

A gas occupies 4.98 L at 2.6 atm of pressure. What volume does it occupy at 1.8 atm pressure?

• 12.9 L
• 0.72 L
• 7.2 L
• 3.44 L

Bill Belichick uses a lot of hairspray to keep his hair looking good while coaching an entire game. If his can of hairspray has an initial temperature of 22°C and a pressure of 18.5 psi, what would be the final temperature of the gas is the pressure decreases to 16.9 psi after use?

• 176 K
• 322 K
• 323 K
• 269 K

Convert 542 mm pressure to atm.

A weather balloon has a volume of 105L at 0.97 atm when the temperature is 318K. What is the volume at 293K and 1.05 atm?

• 89.4 L

• 0.32 L

• 93.8 L

• 3.13 L

If the pressure exerted by a gas at a temperature of 298 K in a volume of 0.044 L is 3.81 atm, how many moles of gas are present? R = 0.0821 L*atm/mol*K OR R=8.31J⋅K⁻¹⋅mol⁻¹

^{Pick your R value based on the units in your problem.}

• .002766 mole

• .0069 mol

• 2.766 mol

• 9.887 mol

A mixture of hydrogen, nitrogen, and water vapor has a total pressure of 864 mmHg. The partial pressure of hydrogen is 220 mmHg and that of nitrogen is 410 mmHg. What is the partial pressure of water vapor?

• 234 mmHg
• 1.37 mmHg
• 2.64 mmHg
• 1, 494 mmHg

Effusion is

• used to describe the combustibility of a gas.
• ability of a gas to escape through a tiny opening
• what occurs after diffusion.
• the ability of a gas to mix with other gases.

The rate of effusion of water vapor is 0.391 and the rate of effusion of propane is 0.251 at the same temperature and pressure.  What is the molar mass of propane? (write the formula and show your work)

• 44.0 g/mol
• 6.63 g/mol
• 0.37 g/mol
• 28.2 g/mol