Practice Gas Laws in Chemistry

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

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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_2 (M=44.0M = 44.0) are in a 5.005.00-L cylinder at 2.002.00 atm and 300300 K? (R=0.0821R = 0.0821)

Example 2

easy
Do gas laws apply to liquids and solids?

Example 3

medium
A 0.2500.250-mol sample of an ideal gas occupies 5.005.00 L at 295295 K. Find its pressure in atm. (R=0.0821R = 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 2.02.0 mol of gas at 25°C25°\text{C} and 1.0 atm1.0\,\text{atm}. (R=0.0821 L\cdotpatm/mol\cdotpKR = 0.0821\,\text{L·atm/mol·K})

Example 7

medium
A gas at 1.501.50 atm in 4.004.00 L is compressed to 2.002.00 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 4.404.40 g and occupies 2.242.24 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/vNev_{He}/v_{Ne}? (MHe=4M_{He}=4, MNe=20M_{Ne}=20)

Example 15

hard
A scuba tank holds 12.012.0 L of air at 200200 atm and 300300 K. If released to 1.001.00 atm at 300300 K, what total volume of air is available?

Example 16

hard
How many liters of O2_2 at 1.001.00 atm and 298298 K are needed to burn 16.016.0 g CH4_4 (M=16.0M=16.0)? Reaction: CH4+2O2→CO2+2H2O\text{CH}_4 + 2\text{O}_2 \rightarrow \text{CO}_2 + 2\text{H}_2\text{O}. (R=0.0821R=0.0821)

Example 17

easy
Convert −23 °C-23\,°\text{C} to Kelvin.

Example 18

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

Example 19

medium
A gas occupies 2.402.40 L at 1.001.00 atm. If the pressure increases to 1.501.50 atm at constant temperature, what is the new volume?

Example 20

challenge
Hydrogen gas is collected over water at 25 °C25\,°\text{C} and 755755 mmHg total pressure. The vapor pressure of water at 25 °C25\,°\text{C} is 2424 mmHg. Find the partial pressure of H2_2.
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