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 = 4 molV = 10 LT = 65 °CP = ?

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

n = 4 molV = 10 LT = 65 °CR = 8.314 J/(mol·K)
P = kPa
2.Easy
n = 3 molV = 15 LT = 110 °CP = ?

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

n = 3 molV = 15 LT = 110 °CR = 8.314 J/(mol·K)
P = kPa
3.Medium
80 g of CH₄P = 650 kPaT = 15 °CV = ?

What volume V does 80 g of CH₄ occupy at 650 kPa and 15 °C? Treat it as an ideal gas.

m = 80 gM = 16.04 g/molP = 650 kPaT = 15 °CR = 8.314 J/(mol·K)
V = L
4.Medium
80 g of CO₂V = 5 LT = 80 °CP = ?

A tank of 5 L contains 80 g of CO₂ at 80 °C. Treat it as an ideal gas and find the pressure P.

m = 80 gM = 44.01 g/molV = 5 LT = 80 °CR = 8.314 J/(mol·K)
P = kPa
5.Hard
He, M = 4.003 g/molP = 900 kPaT = 180 °Cρ = ?

Find the density ρ of He at 900 kPa and 180 °C, treating it as an ideal gas.

M = 4.003 g/molP = 900 kPaT = 180 °CR = 8.314 J/(mol·K)
ρ = kg/m³
6.Hard
Ar, M = 39.95 g/molP = 650 kPaT = 80 °Cρ = ?

Find the density ρ of Ar at 650 kPa and 80 °C, treating it as an ideal gas.

M = 39.95 g/molP = 650 kPaT = 80 °CR = 8.314 J/(mol·K)
ρ = kg/m³

Answer key

  1. 1. P = 1125 kPa
  2. 2. P = 637.1 kPa
  3. 3. V = 18.38 L
  4. 4. P = 1067 kPa
  5. 5. ρ = 0.9563 kg/m³
  6. 6. ρ = 8.844 kg/m³

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