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 = 40 LT = 115 °CP = ?

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

n = 5 molV = 40 LT = 115 °CR = 8.314 J/(mol·K)
P = kPa
2.Easy
n = 3 molV = 25 LT = 55 °CP = ?

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

n = 3 molV = 25 LT = 55 °CR = 8.314 J/(mol·K)
P = kPa
3.Medium
140 g of ArV = 50 LT = 15 °CP = ?

A tank of 50 L contains 140 g of Ar at 15 °C. Treat it as an ideal gas and find the pressure P.

m = 140 gM = 39.95 g/molV = 50 LT = 15 °CR = 8.314 J/(mol·K)
P = kPa
4.Medium
480 g of N₂V = 50 LT = 30 °CP = ?

A tank of 50 L contains 480 g of N₂ at 30 °C. Treat it as an ideal gas and find the pressure P.

m = 480 gM = 28.01 g/molV = 50 LT = 30 °CR = 8.314 J/(mol·K)
P = kPa
5.Hard
State 1State 2

A fixed amount of CO₂ goes from 250 kPa, 10 L, 30 °C to 300 kPa and 230 °C. Find the new volume V2.

P1 = 250 kPaV1 = 10 LT1 = 30 °CP2 = 300 kPaT2 = 230 °C
V2 = L
6.Hard
O₂, M = 32 g/molP = 650 kPaT = 130 °Cρ = ?

Find the density ρ of O₂ at 650 kPa and 130 °C, treating it as an ideal gas.

M = 32 g/molP = 650 kPaT = 130 °CR = 8.314 J/(mol·K)
ρ = kg/m³

Answer key

  1. 1. P = 403.4 kPa
  2. 2. P = 327.4 kPa
  3. 3. P = 167.9 kPa
  4. 4. P = 863.8 kPa
  5. 5. V2 = 13.83 L
  6. 6. ρ = 6.206 kg/m³

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