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 = 2.5 molV = 15 LT = 15 °CP = ?

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

n = 2.5 molV = 15 LT = 15 °CR = 8.314 J/(mol·K)
P = kPa
2.Easy
n = 1 molV = 20 LT = 30 °CP = ?

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

n = 1 molV = 20 LT = 30 °CR = 8.314 J/(mol·K)
P = kPa
3.Medium
370 g of HeV = 10 LT = 60 °CP = ?

A tank of 10 L contains 370 g of He at 60 °C. Treat it as an ideal gas and find the pressure P.

m = 370 gM = 4.003 g/molV = 10 LT = 60 °CR = 8.314 J/(mol·K)
P = kPa
4.Medium
230 g of ArP = 800 kPaT = 5 °CV = ?

What volume V does 230 g of Ar occupy at 800 kPa and 5 °C? Treat it as an ideal gas.

m = 230 gM = 39.95 g/molP = 800 kPaT = 5 °CR = 8.314 J/(mol·K)
V = L
5.Hard
He, M = 4.003 g/molP = 100 kPaT = 30 °Cρ = ?

Find the density ρ of He at 100 kPa and 30 °C, treating it as an ideal gas.

M = 4.003 g/molP = 100 kPaT = 30 °CR = 8.314 J/(mol·K)
ρ = kg/m³
6.Hard
State 1State 2

A fixed amount of He goes from 200 kPa, 5 L, 20 °C to 800 kPa and 80 °C. Find the new volume V2.

P1 = 200 kPaV1 = 5 LT1 = 20 °CP2 = 800 kPaT2 = 80 °C
V2 = L

Answer key

  1. 1. P = 399.3 kPa
  2. 2. P = 126 kPa
  3. 3. P = 25602 kPa
  4. 4. V = 16.64 L
  5. 5. ρ = 0.1588 kg/m³
  6. 6. V2 = 1.506 L

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