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 = 10 LT = 110 °CP = ?

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

n = 5 molV = 10 LT = 110 °CR = 8.314 J/(mol·K)
P = kPa
2.Easy
n = 3 molV = 20 LT = 25 °CP = ?

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

n = 3 molV = 20 LT = 25 °CR = 8.314 J/(mol·K)
P = kPa
3.Medium
250 g of O₂V = 5 LT = 85 °CP = ?

A tank of 5 L contains 250 g of O₂ at 85 °C. Treat it as an ideal gas and find the pressure P.

m = 250 gM = 32 g/molV = 5 LT = 85 °CR = 8.314 J/(mol·K)
P = kPa
4.Medium
360 g of ArP = 250 kPaT = 45 °CV = ?

What volume V does 360 g of Ar occupy at 250 kPa and 45 °C? Treat it as an ideal gas.

m = 360 gM = 39.95 g/molP = 250 kPaT = 45 °CR = 8.314 J/(mol·K)
V = L
5.Hard
CH₄, M = 16.04 g/molP = 850 kPaT = 160 °Cρ = ?

Find the density ρ of CH₄ at 850 kPa and 160 °C, treating it as an ideal gas.

M = 16.04 g/molP = 850 kPaT = 160 °CR = 8.314 J/(mol·K)
ρ = kg/m³
6.Hard
Ar, M = 39.95 g/molP = 650 kPaT = 10 °Cρ = ?

Find the density ρ of Ar at 650 kPa and 10 °C, treating it as an ideal gas.

M = 39.95 g/molP = 650 kPaT = 10 °CR = 8.314 J/(mol·K)
ρ = kg/m³

Answer key

  1. 1. P = 1593 kPa
  2. 2. P = 371.8 kPa
  3. 3. P = 4653 kPa
  4. 4. V = 95.34 L
  5. 5. ρ = 3.786 kg/m³
  6. 6. ρ = 11.03 kg/m³

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