Ap Chem Ch 6 Gas Laws

Ap Chem Ch 6 Gas Laws

By Connie Schaef

​Converting between Pressure Units

​

The pressure in Denver, Colorado (elevation​ 5280 ft), averages about 24.9 inHg. Convert this pressure to each indicated unit.

​

a. Atm​

b. mm Hg

c. psi

d. Pa​

Multiple Choice

The pressure on top of Mount Everest (29,029 ft) averages about 235 mm Hg. Convert this pressure to torr.

• 0.309 torrs

• 15.9 torrs

• 235 torrs

• 7.96 torrs

Multiple Choice

The pressure on top of Mount Everest (29,029 ft) averages about 235 mm Hg. Convert this pressure to psi.

• 0.0210 psi

• 4.54 psi

• 2.63 x 10^6 psi

• 51.7 psi

Multiple Choice

The pressure on top of Mount Everest (29,029 ft) averages about 235 mm Hg. Convert this pressure to atm.

• 0.309 atm

• 1.79 x 10^5 atm

• 4.54 atm

• 3.09 atm

Manometer Calculations

​Temperature

is always measured Kelvin

K = C + 273

Also, remember that 1 K = 1 C so if doing a change in temperature it is the same.

​A sample of gas has an initial volume of 5.6 L at a pressure of 735 mm Hg. If the volume of the gas is increased to 9.4 L, what is the pressure?

Multiple Choice

A sample of gas has an initial volume of 13.9 L at a pressure of 1.22 atm. If the same is compressed to a volume of 10.3 L, what is its pressure?

• 1.65 atm

• 1.11 atm

• 0.904 atm

• 0.00852 atm

​A 48.3 mL sample of gas in a cylinder is warmed from 22^o C to 87^o C. What is its volume at the final temperature? (watch labels)

Multiple Choice

A syringe containing 1.55 mL of oxygen gas is cooled from 95.3 ^o C to 0.0 ^o C. What is the final volume of the oxygen gas?

• 0.0 mL

• 2.09 mL

• 1.15 mL

• 4.44 mL

​22.4 L = 1 mole

​A balloon contains 0.158 mol of gas and has a volume of 2.46 L. If an additional 0.113 mol of gas is added to the balloon (at the same temperature and pressure), what is its final volume?

Multiple Choice

A cylinder with a moveable piston contains 0.553 mol of gas and has a volume of 253 mL. What is its volume if an additional 0.365 mol of gas is added to the cylinder?

• 419 mL

• 152 mL

• 128 mL

• 167 mL

​What volume is occupied by 0.118 mol of helium gas at a pressure of 0.97 atm and a temperature of 305 K? Would the volume be different if the gas was argon (under the same conditions)?

​What is the pressure in a 10.0 L cylinder filled with 0.448 mol of nitrogen gas at a temperature of 315 K?

​A automobile tire has a maximum rating of 38.0 psi (gauge pressure). The tire is inflated (while cold) to a volume of 11.8 L and a gauge pressure of 36.0 psi at a temperature of 12.0 ^o C. On a hot day, the tire warms to 65.0 ^o C, and its volume expands to 12.2 L. Does the pressure in the tire exceed its maximum rating? (Note: The gauge pressure is the difference between the total pressure and atmospheric pressure. In this case, assume that atmospheric pressure is 14.7 psi)