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 = 65 °CP = ?

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

n = 0.5 molV = 40 LT = 65 °CR = 8.314 J/(mol·K)
P = kPa
2.Easy
n = 1.5 molV = 5 LT = 55 °CP = ?

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

n = 1.5 molV = 5 LT = 55 °CR = 8.314 J/(mol·K)
P = kPa
3.Medium
370 g of N₂P = 400 kPaT = 55 °CV = ?

What volume V does 370 g of N₂ occupy at 400 kPa and 55 °C? Treat it as an ideal gas.

m = 370 gM = 28.01 g/molP = 400 kPaT = 55 °CR = 8.314 J/(mol·K)
V = L
4.Medium
140 g of O₂P = 450 kPaT = 100 °CV = ?

What volume V does 140 g of O₂ occupy at 450 kPa and 100 °C? Treat it as an ideal gas.

m = 140 gM = 32 g/molP = 450 kPaT = 100 °CR = 8.314 J/(mol·K)
V = L
5.Hard
O₂, M = 32 g/molP = 300 kPaT = 80 °Cρ = ?

Find the density ρ of O₂ at 300 kPa and 80 °C, treating it as an ideal gas.

M = 32 g/molP = 300 kPaT = 80 °CR = 8.314 J/(mol·K)
ρ = kg/m³
6.Hard
State 1State 2

A fixed amount of CH₄ goes from 300 kPa, 5 L, 15 °C to 350 kPa and 70 °C. Find the new volume V2.

P1 = 300 kPaV1 = 5 LT1 = 15 °CP2 = 350 kPaT2 = 70 °C
V2 = L

Answer key

  1. 1. P = 35.14 kPa
  2. 2. P = 818.5 kPa
  3. 3. V = 90.1 L
  4. 4. V = 30.16 L
  5. 5. ρ = 3.27 kg/m³
  6. 6. V2 = 5.104 L

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