Lesson 5.3.2.1

5.3.2.1 Moles (HT only) Quiz: AQA Combined Science, Unit 10

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 5.3.2.1, Moles (HT only): 20 multiple choice questions for the AQA GCSE Combined Science (8464), Unit 10: Quantitative chemistry, written with Revision Ninja.

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The 20 questions

  1. What is the unit of amount of substance?

    • molar mass (M)
    • litre (l)
    • mole (mol)
    • gram (g)

  2. What is the value of the Avogadro constant?

    • 3.00 x 10^8 per mole
    • 6.02 x 10^23 per gram
    • 1.60 x 10^-19 per mole
    • 6.02 x 10^23 per mole

  3. The mass of one mole of a substance in grams is numerically equal to its what?

    • Relative formula mass
    • Density
    • Atomic number
    • Avogadro constant

  4. How many molecules are in one mole of carbon dioxide?

    • 6.02 x 10^23 atoms
    • 44 molecules
    • 12 molecules
    • 6.02 x 10^23 molecules

  5. What does one mole of any substance always contain the same amount of?

    • Volume
    • Particles
    • Density
    • Mass

  6. What is the mass of one mole of CO2? (C = 12, O = 16)

    • 44 g
    • 32 g
    • 28 g
    • 12 g

  7. How many moles are in 36 g of water? (Mr of H2O = 18)

    • 0.5 mol
    • 18 mol
    • 2 mol
    • 648 mol

  8. How many moles are in 10 g of calcium carbonate? (Mr = 100)

    • 10 mol
    • 0.01 mol
    • 1 mol
    • 0.1 mol

  9. What mass of sodium hydroxide (Mr 40) is 0.5 mol?

    • 80 g
    • 0.5 g
    • 20 g
    • 40 g

  10. How many molecules are in 0.5 mol of water?

    • 9.03 x 10^23
    • 6.02 x 10^23
    • 3.01 x 10^23
    • 1.20 x 10^24

  11. What is the mass of 0.25 mol of magnesium oxide? (Mr = 40)

    • 10 g
    • 160 g
    • 40 g
    • 4 g

  12. How many moles are in 4.8 g of magnesium? (Ar = 24)

    • 2 mol
    • 0.2 mol
    • 0.02 mol
    • 24 mol

  13. What is the mass of one mole of chlorine molecules, Cl2?

    • 2 g
    • 35.5 g
    • 71 g
    • 142 g

  14. What is identical in one mole of carbon atoms and one mole of carbon dioxide molecules?

    • Total mass in grams
    • Number of atoms present
    • Number of particles
    • Volume at room temperature

  15. How many moles are in 1.2 x 10^24 molecules?

    • 0.2 mol
    • 0.5 mol
    • 2 mol
    • 20 mol

  16. Which is 0.00035 written in standard form?

    • 3.5 x 10^-3
    • 3.5 x 10^-4
    • 35 x 10^-5
    • 3.5 x 10^4

  17. A calculation gives 0.0458765 mol. What is the answer to 3 significant figures?

    • 0.0459 mol
    • 0.04588 mol
    • 0.046 mol
    • 0.05 mol

  18. How many grams of ammonia (Mr 17) contain 3.01 x 10^23 molecules?

    • 8.5 g
    • 4.25 g
    • 17 g
    • 34 g

  19. How many molecules are in 49 g of sulfuric acid? (Mr 98)

    • 1.5 x 10^23 molecules
    • 6.02 x 10^23 molecules
    • 9.8 x 10^23 molecules
    • 3.01 x 10^23 molecules

  20. Rearrange the equation mass = moles x Mr to make moles the subject.

    • moles = Mr / mass
    • moles = mass x Mr
    • moles = mass / Mr
    • moles = mass - Mr

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