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 = 0.5 molV = 20 LT = 30 °CP = ?

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

n = 0.5 molV = 20 LT = 30 °CR = 8.314 J/(mol·K)
P = kPa
2.Easy
n = 5 molV = 20 LT = 105 °CP = ?

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

n = 5 molV = 20 LT = 105 °CR = 8.314 J/(mol·K)
P = kPa
3.Medium
440 g of ArV = 5 LT = 15 °CP = ?

A tank of 5 L contains 440 g of Ar at 15 °C. Treat it as an ideal gas and find the pressure P.

m = 440 gM = 39.95 g/molV = 5 LT = 15 °CR = 8.314 J/(mol·K)
P = kPa
4.Medium
390 g of CH₄V = 50 LT = 30 °CP = ?

A tank of 50 L contains 390 g of CH₄ at 30 °C. Treat it as an ideal gas and find the pressure P.

m = 390 gM = 16.04 g/molV = 50 LT = 30 °CR = 8.314 J/(mol·K)
P = kPa
5.Hard
O₂, M = 32 g/molP = 250 kPaT = 110 °Cρ = ?

Find the density ρ of O₂ at 250 kPa and 110 °C, treating it as an ideal gas.

M = 32 g/molP = 250 kPaT = 110 °CR = 8.314 J/(mol·K)
ρ = kg/m³
6.Hard
State 1State 2

A fixed amount of CH₄ goes from 200 kPa, 10 L, 35 °C to 200 kPa and 140 °C. Find the new volume V2.

P1 = 200 kPaV1 = 10 LT1 = 35 °CP2 = 200 kPaT2 = 140 °C
V2 = L

Answer key

  1. 1. P = 63.01 kPa
  2. 2. P = 786 kPa
  3. 3. P = 5277 kPa
  4. 4. P = 1226 kPa
  5. 5. ρ = 2.511 kg/m³
  6. 6. V2 = 13.41 L

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