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 = 150 °CP = ?

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

n = 5 molV = 40 LT = 150 °CR = 8.314 J/(mol·K)
P = kPa
2.Easy
n = 2 molV = 15 LT = 45 °CP = ?

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

n = 2 molV = 15 LT = 45 °CR = 8.314 J/(mol·K)
P = kPa
3.Medium
200 g of CH₄V = 20 LT = 0 °CP = ?

A tank of 20 L contains 200 g of CH₄ at 0 °C. Treat it as an ideal gas and find the pressure P.

m = 200 gM = 16.04 g/molV = 20 LT = 0 °CR = 8.314 J/(mol·K)
P = kPa
4.Medium
170 g of CH₄V = 30 LT = 30 °CP = ?

A tank of 30 L contains 170 g of CH₄ at 30 °C. Treat it as an ideal gas and find the pressure P.

m = 170 gM = 16.04 g/molV = 30 LT = 30 °CR = 8.314 J/(mol·K)
P = kPa
5.Hard
CO₂, M = 44.01 g/molP = 550 kPaT = 130 °Cρ = ?

Find the density ρ of CO₂ at 550 kPa and 130 °C, treating it as an ideal gas.

M = 44.01 g/molP = 550 kPaT = 130 °CR = 8.314 J/(mol·K)
ρ = kg/m³
6.Hard
Ar, M = 39.95 g/molP = 900 kPaT = 200 °Cρ = ?

Find the density ρ of Ar at 900 kPa and 200 °C, treating it as an ideal gas.

M = 39.95 g/molP = 900 kPaT = 200 °CR = 8.314 J/(mol·K)
ρ = kg/m³

Answer key

  1. 1. P = 439.8 kPa
  2. 2. P = 352.7 kPa
  3. 3. P = 1416 kPa
  4. 4. P = 890.4 kPa
  5. 5. ρ = 7.222 kg/m³
  6. 6. ρ = 9.14 kg/m³

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