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 = 50 °CP = ?

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

n = 2.5 molV = 15 LT = 50 °CR = 8.314 J/(mol·K)
P = kPa
2.Easy
n = 1 molV = 40 LT = 40 °CP = ?

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

n = 1 molV = 40 LT = 40 °CR = 8.314 J/(mol·K)
P = kPa
3.Medium
400 g of HeV = 10 LT = 55 °CP = ?

A tank of 10 L contains 400 g of He at 55 °C. Treat it as an ideal gas and find the pressure P.

m = 400 gM = 4.003 g/molV = 10 LT = 55 °CR = 8.314 J/(mol·K)
P = kPa
4.Medium
430 g of ArP = 550 kPaT = 10 °CV = ?

What volume V does 430 g of Ar occupy at 550 kPa and 10 °C? Treat it as an ideal gas.

m = 430 gM = 39.95 g/molP = 550 kPaT = 10 °CR = 8.314 J/(mol·K)
V = L
5.Hard
CO₂, M = 44.01 g/molP = 600 kPaT = 70 °Cρ = ?

Find the density ρ of CO₂ at 600 kPa and 70 °C, treating it as an ideal gas.

M = 44.01 g/molP = 600 kPaT = 70 °CR = 8.314 J/(mol·K)
ρ = kg/m³
6.Hard
State 1State 2

A fixed amount of CH₄ goes from 350 kPa, 5 L, 35 °C to 700 kPa and 130 °C. Find the new volume V2.

P1 = 350 kPaV1 = 5 LT1 = 35 °CP2 = 700 kPaT2 = 130 °C
V2 = L

Answer key

  1. 1. P = 447.8 kPa
  2. 2. P = 65.09 kPa
  3. 3. P = 27262 kPa
  4. 4. V = 46.07 L
  5. 5. ρ = 9.256 kg/m³
  6. 6. V2 = 3.271 L

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