Lesson 3.1.2.3

3.1.2.3 The ideal gas equation Quiz: AQA Chemistry, Unit 1

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 3.1.2.3, The ideal gas equation: 20 multiple choice questions for the AQA Chemistry (7405), Unit 1: Physical chemistry, written with Revision Ninja.

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The 20 questions

  1. In the ideal gas equation pV = nRT, what are the SI units of pressure, volume and temperature?

    • kPa, dm3 and C
    • atm, cm3 and K
    • Pa, m3 and K
    • Pa, dm3 and C

  2. What quantity does n represent in the ideal gas equation pV = nRT?

    • Volume in dm³
    • Amount in moles
    • Number of particles
    • Mass in grams

  3. Which expression correctly rearranges pV = nRT to find n?

    • n = V / pRT
    • n = pV / RT
    • n = pRT / V
    • n = RT / pV

  4. What temperature unit must be used in the ideal gas equation, pV = nRT?

    • Centigrade
    • Fahrenheit
    • Celsius
    • Kelvin

  5. Which assumption about intermolecular forces applies to an ideal gas?

    • Permanent ionic attractions
    • Weak hydrogen bonds
    • Strong dipole interactions
    • No intermolecular forces

  6. What is 250 cm3 expressed in m3?

    • 2.5 x 10^-4 m3
    • 2.5 x 10^-6 m3
    • 2.5 x 10^-1 m3
    • 250 m3

  7. Which of these is the SI unit of pressure?

    • Pascal
    • Millimetre of mercury
    • Bar
    • Atmosphere

  8. Calculate the volume occupied by 0.100 mol of an ideal gas at 100 kPa and 298 K. Use R = 8.31 J mol-1 K-1.

    • 2.48 x 10^-3 m3
    • 2.48 x 10^-1 m3
    • 2.48 x 10^-5 m3
    • 24.8 m3

  9. 0.50 g of a gas occupies 250 cm3 at 100 kPa and 300 K. What is its approximate relative molecular mass? Use R = 8.31 J mol-1 K-1.

    • 100
    • 200
    • 50
    • 25

  10. What is the pressure exerted by 0.200 mol of gas in a 2.00 dm3 container at 300 K? Use R = 8.31 J mol-1 K-1.

    • 2.49 x 10^6 Pa
    • 2.49 x 10^5 Pa
    • 2.49 x 10^2 Pa
    • 2.49 x 10^4 Pa

  11. What volume does 1.00 mol of an ideal gas occupy at 273 K and 101 kPa? Use R = 8.31 J mol-1 K-1.

    • 22.5 dm3
    • 225 dm3
    • 0.0225 dm3
    • 2.25 dm3

  12. 0.500 mol of gas is in a 0.0200 m3 container at 200 kPa. What is the temperature? Use R = 8.31 J mol-1 K-1.

    • 1925 K
    • 96.2 K
    • 481 K
    • 962 K

  13. Which change increases the pressure of a fixed mass of gas at constant volume?

    • Decreasing temperature
    • Removing gas particles
    • Increasing volume
    • Increasing temperature

  14. Calculate the volume in dm3 occupied by 0.0500 mol of nitrogen at 25 C and 100 kPa. Use R = 8.31 J mol-1 K-1.

    • 1.24 dm3
    • 0.124 dm3
    • 124 dm3
    • 12.4 dm3

  15. How many moles of gas are in 2.0 dm3 at 1.0 x 10^5 Pa and 27 C? Use R = 8.31 J mol-1 K-1.

    • 0.802 mol
    • 8.02 mol
    • 0.0802 mol
    • 0.00802 mol

  16. A 0.350 g sample of a volatile liquid vaporises at 373 K and 100 kPa, filling a 250 cm3 flask. What is its approximate Mr? Use R = 8.31 J mol-1 K-1.

    • 173.6
    • 34.5
    • 43.4
    • 86.8

  17. Why do real gases deviate from ideal behaviour at high pressures?

    • Significant particle volume
    • Zero particle volume
    • No intermolecular forces
    • High kinetic energy

  18. A fixed amount of ideal gas at 300 K and 100 kPa in a fixed container is heated to 450 K. What is the new pressure?

    • 100 kPa
    • 150 kPa
    • 66.7 kPa
    • 225 kPa

  19. 0.10 mol of O2 and 0.20 mol of N2 are in a 2.0 dm3 container at 300 K. What is the total pressure? Use R = 8.31 J mol-1 K-1.

    • 3.74 x 10^5 Pa
    • 1.25 x 10^2 Pa
    • 1.25 x 10^5 Pa
    • 9.00 x 10^5 Pa

  20. What is 27 C expressed in kelvin?

    • 27 K
    • 300 K
    • 246 K
    • -246 K

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