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 = 40 LT = 0 °CP = ?

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

n = 0.5 molV = 40 LT = 0 °CR = 8.314 J/(mol·K)
P = kPa
2.Easy
n = 2.5 molV = 40 LT = 40 °CP = ?

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

n = 2.5 molV = 40 LT = 40 °CR = 8.314 J/(mol·K)
P = kPa
3.Medium
490 g of O₂V = 50 LT = 80 °CP = ?

A tank of 50 L contains 490 g of O₂ at 80 °C. Treat it as an ideal gas and find the pressure P.

m = 490 gM = 32 g/molV = 50 LT = 80 °CR = 8.314 J/(mol·K)
P = kPa
4.Medium
130 g of CH₄V = 10 LT = 50 °CP = ?

A tank of 10 L contains 130 g of CH₄ at 50 °C. Treat it as an ideal gas and find the pressure P.

m = 130 gM = 16.04 g/molV = 10 LT = 50 °CR = 8.314 J/(mol·K)
P = kPa
5.Hard
State 1State 2

A fixed amount of Ar goes from 400 kPa, 5 L, 30 °C to 550 kPa and 150 °C. Find the new volume V2.

P1 = 400 kPaV1 = 5 LT1 = 30 °CP2 = 550 kPaT2 = 150 °C
V2 = L
6.Hard
CH₄, M = 16.04 g/molP = 200 kPaT = 90 °Cρ = ?

Find the density ρ of CH₄ at 200 kPa and 90 °C, treating it as an ideal gas.

M = 16.04 g/molP = 200 kPaT = 90 °CR = 8.314 J/(mol·K)
ρ = kg/m³

Answer key

  1. 1. P = 28.39 kPa
  2. 2. P = 162.7 kPa
  3. 3. P = 899.2 kPa
  4. 4. P = 2177 kPa
  5. 5. V2 = 5.076 L
  6. 6. ρ = 1.063 kg/m³

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