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 = 25 LT = 0 °CP = ?

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

n = 2.5 molV = 25 LT = 0 °CR = 8.314 J/(mol·K)
P = kPa
2.Easy
n = 5 molV = 40 LT = 130 °CP = ?

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

n = 5 molV = 40 LT = 130 °CR = 8.314 J/(mol·K)
P = kPa
3.Medium
320 g of CH₄V = 5 LT = 50 °CP = ?

A tank of 5 L contains 320 g of CH₄ at 50 °C. Treat it as an ideal gas and find the pressure P.

m = 320 gM = 16.04 g/molV = 5 LT = 50 °CR = 8.314 J/(mol·K)
P = kPa
4.Medium
320 g of O₂P = 750 kPaT = 80 °CV = ?

What volume V does 320 g of O₂ occupy at 750 kPa and 80 °C? Treat it as an ideal gas.

m = 320 gM = 32 g/molP = 750 kPaT = 80 °CR = 8.314 J/(mol·K)
V = L
5.Hard
O₂, M = 32 g/molP = 300 kPaT = 110 °Cρ = ?

Find the density ρ of O₂ at 300 kPa and 110 °C, treating it as an ideal gas.

M = 32 g/molP = 300 kPaT = 110 °CR = 8.314 J/(mol·K)
ρ = kg/m³
6.Hard
He, M = 4.003 g/molP = 950 kPaT = 10 °Cρ = ?

Find the density ρ of He at 950 kPa and 10 °C, treating it as an ideal gas.

M = 4.003 g/molP = 950 kPaT = 10 °CR = 8.314 J/(mol·K)
ρ = kg/m³

Answer key

  1. 1. P = 227.1 kPa
  2. 2. P = 419 kPa
  3. 3. P = 10720 kPa
  4. 4. V = 39.15 L
  5. 5. ρ = 3.014 kg/m³
  6. 6. ρ = 1.615 kg/m³

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