Skip to content
Try on iPad

The mole and the Avogadro constant: CAIE IGCSE Chemistry questions

Every CAIE IGCSE Chemistry exam question on 3.3 The mole and the Avogadro constant, June 2024 and the specimen papers, with its mark scheme and examiner’s report.

Find questions407
Calculations

407 questions

  1. Q10

    June 2024 · Paper 2

    1 mark3.3 The mole and the Avogadro constant
    The whole paper ↗
    June 2024 Paper 2, question 10: When heated, copper(II) oxide, CuO, reacts with ammonia, NH3. 3CuO + 2NH3 → 3Cu + N2 + 3H2O 8.5g of ammonia reacts with an excess of copper(II) oxide to produce

  2. Q12

    June 2024 · Paper 2

    1 mark3.3 The mole and the Avogadro constant
    The whole paper ↗
    June 2024 Paper 2, question 12: Magnesium chloride, MgCl 2, contains magnesium ions and chloride ions. How many chloride ions are present in two moles of magnesium chloride? 6.02 × 1023 A 1.20

  3. Q6(d)(ii)

    June 2024 · Paper 3

    1 mark3.3 The mole and the Avogadro constant
    The whole paper ↗
    June 2024 Paper 3, question 6(d)(ii): Changing concentration changes the rate of a reaction. Choose the correct unit of concentration from the list. Draw a circle around your chosen answer. dm3 /

  4. Q5(d)(i)

    June 2024 · Paper 4

    2 marks3.3 The mole and the Avogadro constant12.1 Experimental design
    The whole paper ↗
    June 2024 Paper 4, question 5(d)(i): Describe what else the student should do to ensure that all the water has been given off. No other substances are required. [2]

  5. Q5(d)(ii)

    June 2024 · Paper 4

    4 marks3.3 The mole and the Avogadro constant
    The whole paper ↗
    June 2024 Paper 4, question 5(d)(ii): In an experiment, 1.405 g of CoSO4•xH2O is heated until all the water is given off. The mass of CoSO4 that remains is 0.775 g. [Mr: CoSO4, 155; H2O, 18] Det

  6. Q7(a)(i)

    June 2024 · Paper 4

    3 marks3.3 The mole and the Avogadro constant
    The whole paper ↗
    June 2024 Paper 4, question 7(a)(i): Organic compound A has the following composition by mass. C, 82.76%; H, 17.24% Calculate the empirical formula of compound A. empirical formula = [3]

  7. Q7(a)(ii)

    June 2024 · Paper 4

    1 mark3.3 The mole and the Avogadro constant
    The whole paper ↗
    June 2024 Paper 4, question 7(a)(ii): Compound B has the empirical formula CH2 and a relative molecular mass of 70. Determine the molecular formula of compound B. molecular formula = [1]

  8. Q8

    Specimen · Paper 2

    1 mark3.3 The mole and the Avogadro constant
    The whole paper ↗
    Specimen Paper 2, question 8: The equation for the reaction between sodium carbonate and excess dilute hydrochloric acid is shown. Na2CO3 + 2HCl → 2NaCl + H2O + CO2 When 26.5 g of sodium car

  9. Q9

    Specimen · Paper 2

    1 mark3.3 The mole and the Avogadro constant
    The whole paper ↗
    Specimen Paper 2, question 9: A volumetric pipette is used to measure 25.0 cm3 of 2.0 mol / dm3 aqueous sodium hydroxide into a conical flask. A burette is filled with dilute sulfuric acid.

  10. Q2(a)(i)

    Specimen · Paper 3

    1 mark3.3 The mole and the Avogadro constant
    The whole paper ↗
    Specimen Paper 3, question 2(a)(i): Calculate the mass of calcium ions present in a 20 cm3 sample of this milk. mass of calcium ions = mg [1]

  11. Q3(b)(ii)

    Specimen · Paper 4

    3 marks3.3 The mole and the Avogadro constant
    The whole paper ↗
    Specimen Paper 4, question 3(b)(ii): Calculate the volume of oxygen, measured at r.t.p., which is formed when 1.60 g of CuO reacts as shown in the equation. 4CuO → 2Cu2O + O2 dm3 [3]

  12. Q4(c)(ii)

    Specimen · Paper 4

    4 marks3.3 The mole and the Avogadro constant
    The whole paper ↗
    Specimen Paper 4, question 4(c)(ii): Determine the concentration of the dilute sulfuric acid in g / dm3 using the following steps. • Calculate the number of moles of aqueous sodium hydroxide added
All 12 questions on The mole and the Avogadro constant, as a list
  1. June 2024, Paper 2, Q10 (1 mark): When heated, copper(II) oxide, CuO, reacts with ammonia, NH3. 3CuO + 2NH3 → 3Cu + N2 + 3H2O 8.5g of ammonia reacts with an excess of copper(II) oxide to produce
  2. June 2024, Paper 2, Q12 (1 mark): Magnesium chloride, MgCl 2, contains magnesium ions and chloride ions. How many chloride ions are present in two moles of magnesium chloride? 6.02 × 1023 A 1.20
  3. June 2024, Paper 3, Q6(d)(ii) (1 mark): Changing concentration changes the rate of a reaction. Choose the correct unit of concentration from the list. Draw a circle around your chosen answer. dm3 /
  4. June 2024, Paper 4, Q5(d)(i) (2 marks): Describe what else the student should do to ensure that all the water has been given off. No other substances are required. [2]
  5. June 2024, Paper 4, Q5(d)(ii) (4 marks): In an experiment, 1.405 g of CoSO4•xH2O is heated until all the water is given off. The mass of CoSO4 that remains is 0.775 g. [Mr: CoSO4, 155; H2O, 18] Det
  6. June 2024, Paper 4, Q7(a)(i) (3 marks): Organic compound A has the following composition by mass. C, 82.76%; H, 17.24% Calculate the empirical formula of compound A. empirical formula = [3]
  7. June 2024, Paper 4, Q7(a)(ii) (1 mark): Compound B has the empirical formula CH2 and a relative molecular mass of 70. Determine the molecular formula of compound B. molecular formula = [1]
  8. Specimen, Paper 2, Q8 (1 mark): The equation for the reaction between sodium carbonate and excess dilute hydrochloric acid is shown. Na2CO3 + 2HCl → 2NaCl + H2O + CO2 When 26.5 g of sodium car
  9. Specimen, Paper 2, Q9 (1 mark): A volumetric pipette is used to measure 25.0 cm3 of 2.0 mol / dm3 aqueous sodium hydroxide into a conical flask. A burette is filled with dilute sulfuric acid.
  10. Specimen, Paper 3, Q2(a)(i) (1 mark): Calculate the mass of calcium ions present in a 20 cm3 sample of this milk. mass of calcium ions = mg [1]
  11. Specimen, Paper 4, Q3(b)(ii) (3 marks): Calculate the volume of oxygen, measured at r.t.p., which is formed when 1.60 g of CuO reacts as shown in the equation. 4CuO → 2Cu2O + O2 dm3 [3]
  12. Specimen, Paper 4, Q4(c)(ii) (4 marks): Determine the concentration of the dilute sulfuric acid in g / dm3 using the following steps. • Calculate the number of moles of aqueous sodium hydroxide added

Questions, mark schemes and examiner’s reports are © Cambridge University Press & Assessment, from their published past papers. Plumi isn’t affiliated with any exam board. Want whole papers? Every CAIE IGCSE Chemistry paper.

Rather write your answers by hand on iPad? Plumi marks them against the same mark schemes.