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

In partnership with Revision Ninja

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.

Host it live on the board and students join with a game code on their own devices, or revise alone with Free Play. The answers are revealed in the game.

Host this setFree Play

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 does n represent in pV = nRT?

    • The mass of gas in grams
    • The number of moles of gas
    • The number of molecules per litre
    • The number of atoms per molecule

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

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

  4. Why must the temperature be in kelvin when using pV = nRT?

    • Because the gas constant only works with whole numbers, so temperatures must be rounded to kelvin
    • Because kelvin is the SI unit for volume, so the temperature must be converted before the calculation
    • Because kelvin values are always larger than Celsius values, which makes the calculation safer overall
    • Because the equation needs the absolute scale, where zero is the point of zero molecular kinetic energy

  5. Which assumption is made about molecules in an ideal gas?

    • They all have the same mass and charge
    • They move at a fixed speed in a fixed direction
    • They have large volumes and strong attractions
    • They have negligible volume and 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 would most increase the pressure of a fixed mass of ideal gas at constant volume?

    • Increasing the volume of the container
    • Removing some of the gas from the vessel
    • Decreasing the temperature in kelvin
    • Increasing the temperature in kelvin

  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 pressure?

    • At high pressure, molecules are closer together, so their volume and intermolecular forces become significant
    • At high pressure, gas molecules stop moving, so the gas no longer obeys the ideal gas equation
    • At high pressure, the gas constant changes value, which alters how the ideal gas equation behaves
    • At high pressure, molecules are converted into ions, so the gas stops behaving ideally in practice

  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

All AQA Chemistry quizzes