Practice Gas Laws in Chemistry

Use these practice problems to test your method after reviewing the concept explanation and worked examples.

Worksheet PDF Free Answer-key PDF Family

Quick Recap

A set of mathematical relationships that describe how the pressure, volume, temperature, and amount (moles) of a gas are interconnected.

How gases behave when you squeeze them, heat them, or add more.

Showing a random 20 of 50 problems.

Example 1

medium
How many grams of CO2 (M=44.0) are in a 5.00-L cylinder at 2.00 atm and 300 K? (R=0.0821)

Example 2

easy
Do gas laws apply to liquids and solids?

Example 3

medium
A 0.250-mol sample of an ideal gas occupies 5.00 L at 295 K. Find its pressure in atm. (R=0.0821)

Example 4

medium
A gas at 2 atm and 300 K is heated to 600 K at constant volume. Find the new pressure (Gay-Lussac's law).

Example 5

challenge
What is the density of CO2 (molar mass 44) at STP, using molar volume 22.4 L/mol?

Example 6

medium
Use the ideal gas law to find the volume occupied by 2.0 mol of gas at 25°C and 1.0 atm. (R=0.0821 L⋅atm/mol⋅K)

Example 7

medium
A gas at 1.50 atm in 4.00 L is compressed to 2.00 L at constant T. Find the new pressure.

Example 8

medium
Find the moles of an ideal gas at P=2 atm, V=10 L, T=300 K (R=0.0821).

Example 9

medium
A gas at STP (1 atm, 273 K) occupies 22.4 L per mole. How many liters do 2 mol occupy at STP?

Example 10

medium
A sample of unknown gas weighs 4.40 g and occupies 2.24 L at STP. Find its molar mass.

Example 11

easy
At constant temperature and amount, if volume decreases, what happens to pressure (Boyle's law)?

Example 12

medium
A gas at 5 atm in 3 L expands to 15 L at constant temperature. Find the new pressure (Boyle's law).

Example 13

easy
Using PV = nRT with n=1, R=0.0821, T=300 K, V=24.63 L, find P (in atm).

Example 14

challenge
Two gases He and Ne are at the same temperature. What is the ratio of their average molecular speeds, vHe/vNe? (MHe=4, MNe=20)

Example 15

hard
A scuba tank holds 12.0 L of air at 200 atm and 300 K. If released to 1.00 atm at 300 K, what total volume of air is available?

Example 16

hard
How many liters of O2 at 1.00 atm and 298 K are needed to burn 16.0 g CH4 (M=16.0)? Reaction: CH4+2O2→CO2+2H2O. (R=0.0821)

Example 17

easy
Convert −23 °C to Kelvin.

Example 18

easy
Convert 27 degrees C to Kelvin for a gas law calculation.

Example 19

medium
A gas occupies 2.40 L at 1.00 atm. If the pressure increases to 1.50 atm at constant temperature, what is the new volume?

Example 20

challenge
Hydrogen gas is collected over water at 25 °C and 755 mmHg total pressure. The vapor pressure of water at 25 °C is 24 mmHg. Find the partial pressure of H2.
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