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 = 20 LT = 110 °CP = ?

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

n = 1.5 molV = 20 LT = 110 °CR = 8.314 J/(mol·K)
P = kPa
2.Easy
n = 1.5 molV = 50 LT = 120 °CP = ?

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

n = 1.5 molV = 50 LT = 120 °CR = 8.314 J/(mol·K)
P = kPa
3.Medium
330 g of HeV = 10 LT = 0 °CP = ?

A tank of 10 L contains 330 g of He at 0 °C. Treat it as an ideal gas and find the pressure P.

m = 330 gM = 4.003 g/molV = 10 LT = 0 °CR = 8.314 J/(mol·K)
P = kPa
4.Medium
90 g of ArV = 10 LT = 80 °CP = ?

A tank of 10 L contains 90 g of Ar at 80 °C. Treat it as an ideal gas and find the pressure P.

m = 90 gM = 39.95 g/molV = 10 LT = 80 °CR = 8.314 J/(mol·K)
P = kPa
5.Hard
State 1State 2

A fixed amount of Ar goes from 400 kPa, 20 L, 25 °C to 100 kPa and 220 °C. Find the new volume V2.

P1 = 400 kPaV1 = 20 LT1 = 25 °CP2 = 100 kPaT2 = 220 °C
V2 = L
6.Hard
O₂, M = 32 g/molP = 550 kPaT = 110 °Cρ = ?

Find the density ρ of O₂ at 550 kPa and 110 °C, treating it as an ideal gas.

M = 32 g/molP = 550 kPaT = 110 °CR = 8.314 J/(mol·K)
ρ = kg/m³

Answer key

  1. 1. P = 238.9 kPa
  2. 2. P = 98.06 kPa
  3. 3. P = 18721 kPa
  4. 4. P = 661.4 kPa
  5. 5. V2 = 132.3 L
  6. 6. ρ = 5.525 kg/m³

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