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 = 3 molV = 5 LT = 110 °CP = ?

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

n = 3 molV = 5 LT = 110 °CR = 8.314 J/(mol·K)
P = kPa
2.Easy
n = 2 molV = 50 LT = 100 °CP = ?

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

n = 2 molV = 50 LT = 100 °CR = 8.314 J/(mol·K)
P = kPa
3.Medium
100 g of HeP = 350 kPaT = 55 °CV = ?

What volume V does 100 g of He occupy at 350 kPa and 55 °C? Treat it as an ideal gas.

m = 100 gM = 4.003 g/molP = 350 kPaT = 55 °CR = 8.314 J/(mol·K)
V = L
4.Medium
420 g of HeP = 300 kPaT = 25 °CV = ?

What volume V does 420 g of He occupy at 300 kPa and 25 °C? Treat it as an ideal gas.

m = 420 gM = 4.003 g/molP = 300 kPaT = 25 °CR = 8.314 J/(mol·K)
V = L
5.Hard
State 1State 2

A fixed amount of CO₂ goes from 200 kPa, 2 L, 20 °C to 200 kPa and 200 °C. Find the new volume V2.

P1 = 200 kPaV1 = 2 LT1 = 20 °CP2 = 200 kPaT2 = 200 °C
V2 = L
6.Hard
He, M = 4.003 g/molP = 750 kPaT = 10 °Cρ = ?

Find the density ρ of He at 750 kPa and 10 °C, treating it as an ideal gas.

M = 4.003 g/molP = 750 kPaT = 10 °CR = 8.314 J/(mol·K)
ρ = kg/m³

Answer key

  1. 1. P = 1911 kPa
  2. 2. P = 124.1 kPa
  3. 3. V = 194.7 L
  4. 4. V = 866.9 L
  5. 5. V2 = 3.228 L
  6. 6. ρ = 1.275 kg/m³

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