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 = 20 LT = 40 °CP = ?

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

n = 2.5 molV = 20 LT = 40 °CR = 8.314 J/(mol·K)
P = kPa
2.Easy
n = 1 molV = 40 LT = 100 °CP = ?

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

n = 1 molV = 40 LT = 100 °CR = 8.314 J/(mol·K)
P = kPa
3.Medium
160 g of HeV = 20 LT = 45 °CP = ?

A tank of 20 L contains 160 g of He at 45 °C. Treat it as an ideal gas and find the pressure P.

m = 160 gM = 4.003 g/molV = 20 LT = 45 °CR = 8.314 J/(mol·K)
P = kPa
4.Medium
110 g of N₂V = 20 LT = 55 °CP = ?

A tank of 20 L contains 110 g of N₂ at 55 °C. Treat it as an ideal gas and find the pressure P.

m = 110 gM = 28.01 g/molV = 20 LT = 55 °CR = 8.314 J/(mol·K)
P = kPa
5.Hard
CO₂, M = 44.01 g/molP = 250 kPaT = 40 °Cρ = ?

Find the density ρ of CO₂ at 250 kPa and 40 °C, treating it as an ideal gas.

M = 44.01 g/molP = 250 kPaT = 40 °CR = 8.314 J/(mol·K)
ρ = kg/m³
6.Hard
CH₄, M = 16.04 g/molP = 700 kPaT = 40 °Cρ = ?

Find the density ρ of CH₄ at 700 kPa and 40 °C, treating it as an ideal gas.

M = 16.04 g/molP = 700 kPaT = 40 °CR = 8.314 J/(mol·K)
ρ = kg/m³

Answer key

  1. 1. P = 325.4 kPa
  2. 2. P = 77.56 kPa
  3. 3. P = 5286 kPa
  4. 4. P = 535.7 kPa
  5. 5. ρ = 4.226 kg/m³
  6. 6. ρ = 4.313 kg/m³

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