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 = 140 °CP = ?

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

n = 5 molV = 20 LT = 140 °CR = 8.314 J/(mol·K)
P = kPa
2.Easy
n = 2.5 molV = 50 LT = 85 °CP = ?

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

n = 2.5 molV = 50 LT = 85 °CR = 8.314 J/(mol·K)
P = kPa
3.Medium
200 g of N₂V = 50 LT = 50 °CP = ?

A tank of 50 L contains 200 g of N₂ at 50 °C. Treat it as an ideal gas and find the pressure P.

m = 200 gM = 28.01 g/molV = 50 LT = 50 °CR = 8.314 J/(mol·K)
P = kPa
4.Medium
200 g of ArV = 20 LT = 40 °CP = ?

A tank of 20 L contains 200 g of Ar at 40 °C. Treat it as an ideal gas and find the pressure P.

m = 200 gM = 39.95 g/molV = 20 LT = 40 °CR = 8.314 J/(mol·K)
P = kPa
5.Hard
State 1State 2

A fixed amount of N₂ goes from 400 kPa, 2 L, 15 °C to 200 kPa and 60 °C. Find the new volume V2.

P1 = 400 kPaV1 = 2 LT1 = 15 °CP2 = 200 kPaT2 = 60 °C
V2 = L
6.Hard
CH₄, M = 16.04 g/molP = 600 kPaT = 150 °Cρ = ?

Find the density ρ of CH₄ at 600 kPa and 150 °C, treating it as an ideal gas.

M = 16.04 g/molP = 600 kPaT = 150 °CR = 8.314 J/(mol·K)
ρ = kg/m³

Answer key

  1. 1. P = 858.7 kPa
  2. 2. P = 148.9 kPa
  3. 3. P = 383.7 kPa
  4. 4. P = 651.7 kPa
  5. 5. V2 = 4.625 L
  6. 6. ρ = 2.736 kg/m³

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