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 = 5 molV = 40 LT = 15 °CP = ?

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

n = 5 molV = 40 LT = 15 °CR = 8.314 J/(mol·K)
P = kPa
2.Easy
n = 3 molV = 10 LT = 125 °CP = ?

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

n = 3 molV = 10 LT = 125 °CR = 8.314 J/(mol·K)
P = kPa
3.Medium
380 g of HeV = 30 LT = 15 °CP = ?

A tank of 30 L contains 380 g of He at 15 °C. Treat it as an ideal gas and find the pressure P.

m = 380 gM = 4.003 g/molV = 30 LT = 15 °CR = 8.314 J/(mol·K)
P = kPa
4.Medium
420 g of O₂V = 50 LT = 80 °CP = ?

A tank of 50 L contains 420 g of O₂ at 80 °C. Treat it as an ideal gas and find the pressure P.

m = 420 gM = 32 g/molV = 50 LT = 80 °CR = 8.314 J/(mol·K)
P = kPa
5.Hard
CO₂, M = 44.01 g/molP = 600 kPaT = 150 °Cρ = ?

Find the density ρ of CO₂ at 600 kPa and 150 °C, treating it as an ideal gas.

M = 44.01 g/molP = 600 kPaT = 150 °CR = 8.314 J/(mol·K)
ρ = kg/m³
6.Hard
CH₄, M = 16.04 g/molP = 250 kPaT = 110 °Cρ = ?

Find the density ρ of CH₄ at 250 kPa and 110 °C, treating it as an ideal gas.

M = 16.04 g/molP = 250 kPaT = 110 °CR = 8.314 J/(mol·K)
ρ = kg/m³

Answer key

  1. 1. P = 299.5 kPa
  2. 2. P = 993.1 kPa
  3. 3. P = 7581 kPa
  4. 4. P = 770.7 kPa
  5. 5. ρ = 7.506 kg/m³
  6. 6. ρ = 1.259 kg/m³

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