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 = 0.5 molV = 25 LT = 55 °CP = ?

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

n = 0.5 molV = 25 LT = 55 °CR = 8.314 J/(mol·K)
P = kPa
2.Easy
n = 5 molV = 40 LT = 25 °CP = ?

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

n = 5 molV = 40 LT = 25 °CR = 8.314 J/(mol·K)
P = kPa
3.Medium
280 g of HeP = 700 kPaT = 95 °CV = ?

What volume V does 280 g of He occupy at 700 kPa and 95 °C? Treat it as an ideal gas.

m = 280 gM = 4.003 g/molP = 700 kPaT = 95 °CR = 8.314 J/(mol·K)
V = L
4.Medium
30 g of CO₂V = 50 LT = 45 °CP = ?

A tank of 50 L contains 30 g of CO₂ at 45 °C. Treat it as an ideal gas and find the pressure P.

m = 30 gM = 44.01 g/molV = 50 LT = 45 °CR = 8.314 J/(mol·K)
P = kPa
5.Hard
He, M = 4.003 g/molP = 550 kPaT = 170 °Cρ = ?

Find the density ρ of He at 550 kPa and 170 °C, treating it as an ideal gas.

M = 4.003 g/molP = 550 kPaT = 170 °CR = 8.314 J/(mol·K)
ρ = kg/m³
6.Hard
CH₄, M = 16.04 g/molP = 400 kPaT = 100 °Cρ = ?

Find the density ρ of CH₄ at 400 kPa and 100 °C, treating it as an ideal gas.

M = 16.04 g/molP = 400 kPaT = 100 °CR = 8.314 J/(mol·K)
ρ = kg/m³

Answer key

  1. 1. P = 54.56 kPa
  2. 2. P = 309.9 kPa
  3. 3. V = 305.9 L
  4. 4. P = 36.06 kPa
  5. 5. ρ = 0.5976 kg/m³
  6. 6. ρ = 2.068 kg/m³

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