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 = 25 LT = 55 °CP = ?

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

n = 1.5 molV = 25 LT = 55 °CR = 8.314 J/(mol·K)
P = kPa
2.Easy
n = 0.5 molV = 15 LT = 25 °CP = ?

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

n = 0.5 molV = 15 LT = 25 °CR = 8.314 J/(mol·K)
P = kPa
3.Medium
210 g of HeP = 350 kPaT = 95 °CV = ?

What volume V does 210 g of He occupy at 350 kPa and 95 °C? Treat it as an ideal gas.

m = 210 gM = 4.003 g/molP = 350 kPaT = 95 °CR = 8.314 J/(mol·K)
V = L
4.Medium
440 g of HeV = 30 LT = 65 °CP = ?

A tank of 30 L contains 440 g of He at 65 °C. Treat it as an ideal gas and find the pressure P.

m = 440 gM = 4.003 g/molV = 30 LT = 65 °CR = 8.314 J/(mol·K)
P = kPa
5.Hard
CO₂, M = 44.01 g/molP = 650 kPaT = 80 °Cρ = ?

Find the density ρ of CO₂ at 650 kPa and 80 °C, treating it as an ideal gas.

M = 44.01 g/molP = 650 kPaT = 80 °CR = 8.314 J/(mol·K)
ρ = kg/m³
6.Hard
State 1State 2

A fixed amount of CO₂ goes from 150 kPa, 20 L, 25 °C to 400 kPa and 100 °C. Find the new volume V2.

P1 = 150 kPaV1 = 20 LT1 = 25 °CP2 = 400 kPaT2 = 100 °C
V2 = L

Answer key

  1. 1. P = 163.7 kPa
  2. 2. P = 82.63 kPa
  3. 3. V = 458.8 L
  4. 4. P = 10301 kPa
  5. 5. ρ = 9.743 kg/m³
  6. 6. V2 = 9.387 L

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