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 = 4 molV = 25 LT = 25 °CP = ?

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

n = 4 molV = 25 LT = 25 °CR = 8.314 J/(mol·K)
P = kPa
2.Easy
n = 3 molV = 50 LT = 35 °CP = ?

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

n = 3 molV = 50 LT = 35 °CR = 8.314 J/(mol·K)
P = kPa
3.Medium
260 g of HeV = 30 LT = 50 °CP = ?

A tank of 30 L contains 260 g of He at 50 °C. Treat it as an ideal gas and find the pressure P.

m = 260 gM = 4.003 g/molV = 30 LT = 50 °CR = 8.314 J/(mol·K)
P = kPa
4.Medium
410 g of HeV = 20 LT = 40 °CP = ?

A tank of 20 L contains 410 g of He at 40 °C. Treat it as an ideal gas and find the pressure P.

m = 410 gM = 4.003 g/molV = 20 LT = 40 °CR = 8.314 J/(mol·K)
P = kPa
5.Hard
Ar, M = 39.95 g/molP = 750 kPaT = 120 °Cρ = ?

Find the density ρ of Ar at 750 kPa and 120 °C, treating it as an ideal gas.

M = 39.95 g/molP = 750 kPaT = 120 °CR = 8.314 J/(mol·K)
ρ = kg/m³
6.Hard
State 1State 2

A fixed amount of N₂ goes from 400 kPa, 20 L, 35 °C to 500 kPa and 250 °C. Find the new volume V2.

P1 = 400 kPaV1 = 20 LT1 = 35 °CP2 = 500 kPaT2 = 250 °C
V2 = L

Answer key

  1. 1. P = 396.6 kPa
  2. 2. P = 153.7 kPa
  3. 3. P = 5817 kPa
  4. 4. P = 13333 kPa
  5. 5. ρ = 9.167 kg/m³
  6. 6. V2 = 27.16 L

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