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 = 20 LT = 85 °CP = ?

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

n = 5 molV = 20 LT = 85 °CR = 8.314 J/(mol·K)
P = kPa
2.Easy
n = 4 molV = 20 LT = 145 °CP = ?

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

n = 4 molV = 20 LT = 145 °CR = 8.314 J/(mol·K)
P = kPa
3.Medium
330 g of CO₂P = 150 kPaT = 100 °CV = ?

What volume V does 330 g of CO₂ occupy at 150 kPa and 100 °C? Treat it as an ideal gas.

m = 330 gM = 44.01 g/molP = 150 kPaT = 100 °CR = 8.314 J/(mol·K)
V = L
4.Medium
30 g of O₂P = 700 kPaT = 100 °CV = ?

What volume V does 30 g of O₂ occupy at 700 kPa and 100 °C? Treat it as an ideal gas.

m = 30 gM = 32 g/molP = 700 kPaT = 100 °CR = 8.314 J/(mol·K)
V = L
5.Hard
CH₄, M = 16.04 g/molP = 200 kPaT = 30 °Cρ = ?

Find the density ρ of CH₄ at 200 kPa and 30 °C, treating it as an ideal gas.

M = 16.04 g/molP = 200 kPaT = 30 °CR = 8.314 J/(mol·K)
ρ = kg/m³
6.Hard
He, M = 4.003 g/molP = 750 kPaT = 100 °Cρ = ?

Find the density ρ of He at 750 kPa and 100 °C, treating it as an ideal gas.

M = 4.003 g/molP = 750 kPaT = 100 °CR = 8.314 J/(mol·K)
ρ = kg/m³

Answer key

  1. 1. P = 744.4 kPa
  2. 2. P = 695.3 kPa
  3. 3. V = 155.1 L
  4. 4. V = 4.155 L
  5. 5. ρ = 1.273 kg/m³
  6. 6. ρ = 0.9677 kg/m³

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