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 molV = 25 LT = 60 °CP = ?

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

n = 2 molV = 25 LT = 60 °CR = 8.314 J/(mol·K)
P = kPa
2.Easy
n = 0.5 molV = 20 LT = 80 °CP = ?

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

n = 0.5 molV = 20 LT = 80 °CR = 8.314 J/(mol·K)
P = kPa
3.Medium
290 g of O₂P = 400 kPaT = 65 °CV = ?

What volume V does 290 g of O₂ occupy at 400 kPa and 65 °C? Treat it as an ideal gas.

m = 290 gM = 32 g/molP = 400 kPaT = 65 °CR = 8.314 J/(mol·K)
V = L
4.Medium
40 g of N₂V = 50 LT = 35 °CP = ?

A tank of 50 L contains 40 g of N₂ at 35 °C. Treat it as an ideal gas and find the pressure P.

m = 40 gM = 28.01 g/molV = 50 LT = 35 °CR = 8.314 J/(mol·K)
P = kPa
5.Hard
State 1State 2

A fixed amount of O₂ goes from 200 kPa, 10 L, 15 °C to 650 kPa and 240 °C. Find the new volume V2.

P1 = 200 kPaV1 = 10 LT1 = 15 °CP2 = 650 kPaT2 = 240 °C
V2 = L
6.Hard
Ar, M = 39.95 g/molP = 100 kPaT = 40 °Cρ = ?

Find the density ρ of Ar at 100 kPa and 40 °C, treating it as an ideal gas.

M = 39.95 g/molP = 100 kPaT = 40 °CR = 8.314 J/(mol·K)
ρ = kg/m³

Answer key

  1. 1. P = 221.6 kPa
  2. 2. P = 73.4 kPa
  3. 3. V = 63.7 L
  4. 4. P = 73.17 kPa
  5. 5. V2 = 5.48 L
  6. 6. ρ = 1.534 kg/m³

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