Gas Laws Quiz

Identify the choice that best completes the statement or answers the question: A sample of gas occupies 17 mL at -112°C. Assuming the pressure is held constant, what volume does the sample occupy at 70°C?

• 10.6 mL

• 27 mL

• 36 mL

• 8.0 mL

Charles' law states that the:

• a. pressure of a gas is inversely proportional to its temperature in kelvins

• b. volume of a gas is directly proportional to its temperature in kelvins

• c. pressure of a gas is directly proportional to its temperature in kelvins

• d. volume of a gas is inversely proportional to its temperature in kelvins

The volume of a gas is reduced from 4.0 L to 0.5 L while the temperature is held constant. How does the gas pressure change?

• a. It increases by a factor of four.

• b. It decreases by a factor of eight.

• c. It increases by a factor of eight.

• d. It increases by a factor of two.

Convert the pressure 0.840 atm to mm Hg.

• 365 mm Hg

• 437 mm Hg

• 638 mm Hg

• 780 mm Hg

A 70.0 L sample of gas at 20.0°C and 600 mm Hg expands to 90.0 L at 15.0°C. What is the new gas pressure?

• 318 mm Hg

• 459 mm Hg

• 583 mm Hg

• 710 mm Hg

Standard pressure is exactly 101.3 kPa. What is this pressure in other units?

• 1 atm

• 760 mm Hg

• 101.325 atm

• 101 atm

Convert the pressure 2.50 atm to kPa.

• 1 kPa

• 253 kPa

• 760 kPa

• 1000 kPa

A 15.0 L sample of gas is collected at 1.20 atm and 25°C. What volume does the gas have at 1.50 atm and 20.0°C?

• 94 L

• 120 L

• 143 L

• 183 L

The volume of a sample of hydrogen is 798 mL and it exerts 621 mm Hg pressure at 5.00°C. What volume does it occupy at standard temperature and pressure?

• 520 mL

• 745 mL

• 640 mL

• 960 mL

What does the ideal gas law allow a scientist to calculate that the other gas laws do not?

• number of moles

• pressure

• volume

• temperature