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 = 1.5 molV = 15 LT = 55 °CP = ?

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

n = 1.5 molV = 15 LT = 55 °CR = 8.314 J/(mol·K)
P = kPa
2.Easy
n = 1 molV = 20 LT = 75 °CP = ?

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

n = 1 molV = 20 LT = 75 °CR = 8.314 J/(mol·K)
P = kPa
3.Medium
350 g of O₂V = 5 LT = 20 °CP = ?

A tank of 5 L contains 350 g of O₂ at 20 °C. Treat it as an ideal gas and find the pressure P.

m = 350 gM = 32 g/molV = 5 LT = 20 °CR = 8.314 J/(mol·K)
P = kPa
4.Medium
350 g of ArP = 450 kPaT = 90 °CV = ?

What volume V does 350 g of Ar occupy at 450 kPa and 90 °C? Treat it as an ideal gas.

m = 350 gM = 39.95 g/molP = 450 kPaT = 90 °CR = 8.314 J/(mol·K)
V = L
5.Hard
He, M = 4.003 g/molP = 400 kPaT = 180 °Cρ = ?

Find the density ρ of He at 400 kPa and 180 °C, treating it as an ideal gas.

M = 4.003 g/molP = 400 kPaT = 180 °CR = 8.314 J/(mol·K)
ρ = kg/m³
6.Hard
CO₂, M = 44.01 g/molP = 750 kPaT = 70 °Cρ = ?

Find the density ρ of CO₂ at 750 kPa and 70 °C, treating it as an ideal gas.

M = 44.01 g/molP = 750 kPaT = 70 °CR = 8.314 J/(mol·K)
ρ = kg/m³

Answer key

  1. 1. P = 272.8 kPa
  2. 2. P = 144.7 kPa
  3. 3. P = 5331 kPa
  4. 4. V = 58.78 L
  5. 5. ρ = 0.425 kg/m³
  6. 6. ρ = 11.57 kg/m³

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