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 = 1.5 molV = 10 LT = 5 °CP = ?

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

n = 1.5 molV = 10 LT = 5 °CR = 8.314 J/(mol·K)
P = kPa
2.Easy
n = 5 molV = 20 LT = 75 °CP = ?

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

n = 5 molV = 20 LT = 75 °CR = 8.314 J/(mol·K)
P = kPa
3.Medium
450 g of O₂V = 5 LT = 75 °CP = ?

A tank of 5 L contains 450 g of O₂ at 75 °C. Treat it as an ideal gas and find the pressure P.

m = 450 gM = 32 g/molV = 5 LT = 75 °CR = 8.314 J/(mol·K)
P = kPa
4.Medium
80 g of CO₂V = 30 LT = 50 °CP = ?

A tank of 30 L contains 80 g of CO₂ at 50 °C. Treat it as an ideal gas and find the pressure P.

m = 80 gM = 44.01 g/molV = 30 LT = 50 °CR = 8.314 J/(mol·K)
P = kPa
5.Hard
State 1State 2

A fixed amount of Ar goes from 250 kPa, 5 L, 35 °C to 700 kPa and 230 °C. Find the new volume V2.

P1 = 250 kPaV1 = 5 LT1 = 35 °CP2 = 700 kPaT2 = 230 °C
V2 = L
6.Hard
N₂, M = 28.01 g/molP = 600 kPaT = 140 °Cρ = ?

Find the density ρ of N₂ at 600 kPa and 140 °C, treating it as an ideal gas.

M = 28.01 g/molP = 600 kPaT = 140 °CR = 8.314 J/(mol·K)
ρ = kg/m³

Answer key

  1. 1. P = 346.9 kPa
  2. 2. P = 723.6 kPa
  3. 3. P = 8141 kPa
  4. 4. P = 162.8 kPa
  5. 5. V2 = 2.916 L
  6. 6. ρ = 4.893 kg/m³

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