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 = 5 LT = 10 °CP = ?

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

n = 2.5 molV = 5 LT = 10 °CR = 8.314 J/(mol·K)
P = kPa
2.Easy
n = 3 molV = 40 LT = 65 °CP = ?

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

n = 3 molV = 40 LT = 65 °CR = 8.314 J/(mol·K)
P = kPa
3.Medium
450 g of O₂V = 20 LT = 60 °CP = ?

A tank of 20 L contains 450 g of O₂ at 60 °C. Treat it as an ideal gas and find the pressure P.

m = 450 gM = 32 g/molV = 20 LT = 60 °CR = 8.314 J/(mol·K)
P = kPa
4.Medium
60 g of HeP = 100 kPaT = 35 °CV = ?

What volume V does 60 g of He occupy at 100 kPa and 35 °C? Treat it as an ideal gas.

m = 60 gM = 4.003 g/molP = 100 kPaT = 35 °CR = 8.314 J/(mol·K)
V = L
5.Hard
CH₄, M = 16.04 g/molP = 550 kPaT = 120 °Cρ = ?

Find the density ρ of CH₄ at 550 kPa and 120 °C, treating it as an ideal gas.

M = 16.04 g/molP = 550 kPaT = 120 °CR = 8.314 J/(mol·K)
ρ = kg/m³
6.Hard
State 1State 2

A fixed amount of Ar goes from 350 kPa, 5 L, 35 °C to 400 kPa and 90 °C. Find the new volume V2.

P1 = 350 kPaV1 = 5 LT1 = 35 °CP2 = 400 kPaT2 = 90 °C
V2 = L

Answer key

  1. 1. P = 1177 kPa
  2. 2. P = 210.9 kPa
  3. 3. P = 1948 kPa
  4. 4. V = 384 L
  5. 5. ρ = 2.699 kg/m³
  6. 6. V2 = 5.156 L

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