Lesson 3.1.2.2

3.1.2.2 The mole and the Avogadro constant Quiz: AQA Chemistry, Unit 1

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 3.1.2.2, The mole and the Avogadro constant: 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. What is the Avogadro constant?

    • The number of particles in one mole of a substance
    • The mass of one mole of carbon-12 in grams
    • The volume of one mole of gas at room temperature
    • The number of protons in one mole of atoms

  2. Which unit is used for the amount of substance?

    • Kelvin
    • Litre
    • Mole
    • Gram

  3. Which unit is used for the concentration of a substance in solution?

    • mol g-1
    • g dm-3 mol
    • mol dm-3
    • dm3 mol-1

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

    • 18
    • 2
    • 1
    • 0.5

  5. How many moles are in 4.0 g of sodium hydroxide? (Mr = 40)

    • 0.1
    • 1.0
    • 4.0
    • 0.4

  6. How many electrons are in one mole of hydrogen atoms?

    • 2 moles of electrons
    • 1 mole of electrons
    • 0.5 mole of electrons
    • 0 moles of electrons

  7. How many moles of ions are present in one mole of sodium chloride?

    • 1 mole of ions
    • 0.5 mole of ions
    • 58.5 moles of ions
    • 2 moles of ions

  8. A solution of concentration 0.250 mol dm-3 has a volume of 200 cm3. How many moles of solute does it contain?

    • 0.05
    • 0.5
    • 0.0125
    • 1.25

  9. How many moles of NaOH are in 25.0 cm3 of 0.100 mol dm-3 solution?

    • 0.00250
    • 0.0250
    • 0.250
    • 2.50

  10. How many molecules are in 0.5 mol of carbon dioxide, in terms of the Avogadro constant N_A?

    • 0.5 N_A
    • 44 N_A
    • 2 N_A
    • N_A

  11. What mass of magnesium (Ar = 24) contains the same number of atoms as 8.0 g of oxygen (Ar = 16)?

    • 6 g
    • 16 g
    • 24 g
    • 12 g

  12. What is the mass of 0.25 mol of calcium carbonate? (Mr = 100)

    • 25 g
    • 4 g
    • 400 g
    • 100 g

  13. What volume of 2.0 mol dm-3 hydrochloric acid contains 0.10 mol of HCl?

    • 20 cm3
    • 50 cm3
    • 5 cm3
    • 200 cm3

  14. How many atoms are in 0.2 mol of ammonia, NH3?

    • 0.2 N_A
    • 4.0 N_A
    • 0.6 N_A
    • 0.8 N_A

  15. A 1.20 g sample of magnesium (Ar = 24.3) is used. How many moles of magnesium are present?

    • 0.0029 mol
    • 0.0494 mol
    • 0.494 mol
    • 0.0291 mol

  16. 5.85 g of sodium chloride (Mr = 58.5) is dissolved and made up to 250 cm3 of solution. What is the concentration?

    • 0.100 mol dm-3
    • 0.400 mol dm-3
    • 0.0400 mol dm-3
    • 1.00 mol dm-3

  17. How many moles of Na+ ions are present in 0.25 mol of sodium sulfate, Na2SO4?

    • 0.75
    • 0.25
    • 0.125
    • 0.50

  18. A compound contains 2.0 x 10^22 molecules. Using N_A = 6.02 x 10^23 mol-1, how many moles are present?

    • 0.332 mol
    • 0.0332 mol
    • 0.00332 mol
    • 3.32 mol

  19. Which statement about 1 mol of chlorine molecules, Cl2, and 1 mol of chlorine atoms is correct?

    • Cl2 contains half the number of atoms of 1 mol of Cl, because each atom is paired
    • 1 mol of Cl2 contains 2 mol of atoms, so there are twice as many atoms
    • They contain the same number of atoms, because both samples contain one mole of chlorine
    • They have the same mass, because the number of chlorine atoms in each sample is identical

  20. What volume of a 0.100 mol dm-3 solution contains 0.0150 mol of solute?

    • 1500 cm3
    • 150 cm3
    • 0.150 cm3
    • 15 cm3

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