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 = 135 °CP = ?

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

n = 1.5 molV = 20 LT = 135 °CR = 8.314 J/(mol·K)
P = kPa
2.Easy
n = 1.5 molV = 15 LT = 35 °CP = ?

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

n = 1.5 molV = 15 LT = 35 °CR = 8.314 J/(mol·K)
P = kPa
3.Medium
120 g of O₂V = 20 LT = 60 °CP = ?

A tank of 20 L contains 120 g of O₂ at 60 °C. Treat it as an ideal gas and find the pressure P.

m = 120 gM = 32 g/molV = 20 LT = 60 °CR = 8.314 J/(mol·K)
P = kPa
4.Medium
150 g of HeV = 20 LT = 55 °CP = ?

A tank of 20 L contains 150 g of He at 55 °C. Treat it as an ideal gas and find the pressure P.

m = 150 gM = 4.003 g/molV = 20 LT = 55 °CR = 8.314 J/(mol·K)
P = kPa
5.Hard
State 1State 2

A fixed amount of Ar goes from 200 kPa, 5 L, 15 °C to 100 kPa and 250 °C. Find the new volume V2.

P1 = 200 kPaV1 = 5 LT1 = 15 °CP2 = 100 kPaT2 = 250 °C
V2 = L
6.Hard
N₂, M = 28.01 g/molP = 200 kPaT = 70 °Cρ = ?

Find the density ρ of N₂ at 200 kPa and 70 °C, treating it as an ideal gas.

M = 28.01 g/molP = 200 kPaT = 70 °CR = 8.314 J/(mol·K)
ρ = kg/m³

Answer key

  1. 1. P = 254.5 kPa
  2. 2. P = 256.2 kPa
  3. 3. P = 519.3 kPa
  4. 4. P = 5112 kPa
  5. 5. V2 = 18.16 L
  6. 6. ρ = 1.964 kg/m³

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