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 = 40 LT = 50 °CP = ?

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

n = 1.5 molV = 40 LT = 50 °CR = 8.314 J/(mol·K)
P = kPa
2.Easy
n = 1.5 molV = 40 LT = 55 °CP = ?

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

n = 1.5 molV = 40 LT = 55 °CR = 8.314 J/(mol·K)
P = kPa
3.Medium
380 g of HeP = 700 kPaT = 60 °CV = ?

What volume V does 380 g of He occupy at 700 kPa and 60 °C? Treat it as an ideal gas.

m = 380 gM = 4.003 g/molP = 700 kPaT = 60 °CR = 8.314 J/(mol·K)
V = L
4.Medium
100 g of ArV = 30 LT = 30 °CP = ?

A tank of 30 L contains 100 g of Ar at 30 °C. Treat it as an ideal gas and find the pressure P.

m = 100 gM = 39.95 g/molV = 30 LT = 30 °CR = 8.314 J/(mol·K)
P = kPa
5.Hard
State 1State 2

A fixed amount of CH₄ goes from 150 kPa, 10 L, 20 °C to 400 kPa and 160 °C. Find the new volume V2.

P1 = 150 kPaV1 = 10 LT1 = 20 °CP2 = 400 kPaT2 = 160 °C
V2 = L
6.Hard
He, M = 4.003 g/molP = 900 kPaT = 50 °Cρ = ?

Find the density ρ of He at 900 kPa and 50 °C, treating it as an ideal gas.

M = 4.003 g/molP = 900 kPaT = 50 °CR = 8.314 J/(mol·K)
ρ = kg/m³

Answer key

  1. 1. P = 100.8 kPa
  2. 2. P = 102.3 kPa
  3. 3. V = 375.6 L
  4. 4. P = 210.3 kPa
  5. 5. V2 = 5.541 L
  6. 6. ρ = 1.341 kg/m³

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