Ideal gas law worksheet with answers

Free printable Ideal gas law worksheet: 6 problems from easy to exam level, with an answer key. Print it or save it as a PDF.

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1.Easy
n = 2.5 molV = 5 LT = 125 °CP = ?

A rigid tank holds an ideal gas. Find its pressure P.

n = 2.5 molV = 5 LT = 125 °CR = 8.314 J/(mol·K)
P = kPa
2.Easy
n = 1.5 molV = 10 LT = 95 °CP = ?

A rigid tank holds an ideal gas. Find its pressure P.

n = 1.5 molV = 10 LT = 95 °CR = 8.314 J/(mol·K)
P = kPa
3.Medium
50 g of O₂V = 5 LT = 100 °CP = ?

A tank of 5 L contains 50 g of O₂ at 100 °C. Treat it as an ideal gas and find the pressure P.

m = 50 gM = 32 g/molV = 5 LT = 100 °CR = 8.314 J/(mol·K)
P = kPa
4.Medium
50 g of CO₂V = 20 LT = 25 °CP = ?

A tank of 20 L contains 50 g of CO₂ at 25 °C. Treat it as an ideal gas and find the pressure P.

m = 50 gM = 44.01 g/molV = 20 LT = 25 °CR = 8.314 J/(mol·K)
P = kPa
5.Hard
CO₂, M = 44.01 g/molP = 500 kPaT = 120 °Cρ = ?

Find the density ρ of CO₂ at 500 kPa and 120 °C, treating it as an ideal gas.

M = 44.01 g/molP = 500 kPaT = 120 °CR = 8.314 J/(mol·K)
ρ = kg/m³
6.Hard
State 1State 2

A fixed amount of He goes from 150 kPa, 20 L, 40 °C to 350 kPa and 100 °C. Find the new volume V2.

P1 = 150 kPaV1 = 20 LT1 = 40 °CP2 = 350 kPaT2 = 100 °C
V2 = L

Answer key

  1. 1. P = 1655 kPa
  2. 2. P = 459.1 kPa
  3. 3. P = 969.5 kPa
  4. 4. P = 140.8 kPa
  5. 5. ρ = 6.732 kg/m³
  6. 6. V2 = 10.21 L

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