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Formula mass and empirical formulae: Edexcel GCSE Combined Science questions

Every Edexcel GCSE Combined Science exam question on Formula mass and empirical formulae (specification points 1.43–1.46), 2018–2025, with its mark scheme and examiner’s report.

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2,937 questions

  1. Q5(b)(i)

    June 2025 · Chemistry Paper 1 Higher

    3 marksFormula mass and empirical formulae
    The whole paper ↗

  2. Q3(c)(i)

    June 2025 · Chemistry Paper 1 Foundation

    2 marksFormula mass and empirical formulae
    The whole paper ↗

  3. Q4(b)

    June 2025 · Chemistry Paper 1 Foundation

    2 marksFormula mass and empirical formulae
    The whole paper ↗

  4. Q2(c)

    June 2025 · Chemistry Paper 2 Higher

    3 marksFormula mass and empirical formulae
    The whole paper ↗

  5. Q4(b)(v)

    June 2025 · Chemistry Paper 2 Foundation

    3 marksFormula mass and empirical formulae
    The whole paper ↗

  6. Q6(c)

    June 2025 · Chemistry Paper 2 Foundation

    3 marksFormula mass and empirical formulae
    The whole paper ↗

  7. Q2(b)

    June 2024 · Chemistry Paper 1 Higher

    3 marksFormula mass and empirical formulae
    The whole paper ↗

  8. Q3(b)

    June 2024 · Chemistry Paper 1 Foundation

    3 marksFormula mass and empirical formulae
    The whole paper ↗

  9. Q6(b)

    June 2024 · Chemistry Paper 1 Foundation

    3 marksFormula mass and empirical formulae
    The whole paper ↗

  10. Q4(b)(ii)

    June 2024 · Chemistry Paper 2 Higher

    4 marksCombustion, pollution and fuelsFormula mass and empirical formulae
    The whole paper ↗

  11. Q4(d)

    June 2024 · Chemistry Paper 2 Foundation

    3 marksFormula mass and empirical formulae
    The whole paper ↗

  12. Q6(a)(i)

    June 2023 · Chemistry Paper 1 Higher

    1 markFormula mass and empirical formulae
    The whole paper ↗

  13. Q4(c)

    June 2023 · Chemistry Paper 1 Foundation

    3 marksFormula mass and empirical formulae
    The whole paper ↗

  14. Q5(a)

    June 2023 · Chemistry Paper 2 Higher

    1 markFormula mass and empirical formulae
    The whole paper ↗

  15. Q6(b)

    June 2023 · Chemistry Paper 2 Higher

    4 marksCrackingFormula mass and empirical formulae
    The whole paper ↗

  16. Q2(b)

    June 2022 · Chemistry Paper 1 Higher

    3 marksFormula mass and empirical formulae
    The whole paper ↗

  17. Q3(b)

    June 2022 · Chemistry Paper 1 Foundation

    3 marksFormula mass and empirical formulae
    The whole paper ↗

  18. Q6(b)

    June 2022 · Chemistry Paper 1 Foundation

    3 marksFormula mass and empirical formulae
    The whole paper ↗

  19. Q5(c)

    June 2022 · Chemistry Paper 2 Higher

    4 marksFormula mass and empirical formulae
    The whole paper ↗

  20. Q3(a)(iii)

    June 2022 · Chemistry Paper 2 Foundation

    1 markFormula mass and empirical formulae
    The whole paper ↗
All 40 questions on Formula mass and empirical formulae, as a list
  1. June 2025, Chemistry Paper 1 Higher, Q5(b)(i) (3 marks): Calculate the percentage by mass of oxygen in magnesium sulfate, MgSO4 . (relative atomic mass: O = 16.0 relative formula mass: MgSO4 = 120) Give your answer to
  2. June 2025, Chemistry Paper 1 Foundation, Q3(c)(i) (2 marks): The formula of zinc nitrate is Zn(NO3)2 Calculate the relative formula mass of zinc nitrate, Zn(NO3)2 (relative atomic masses: Zn = 65, N = 14, O = 16) (2) rela
  3. June 2025, Chemistry Paper 1 Foundation, Q4(b) (2 marks): 25 000 kg of an ore of iron was found to contain 10 050 kg of iron. Calculate the percentage of iron in this ore of iron. mass of metal percentage of metal = ma
  4. June 2025, Chemistry Paper 2 Higher, Q2(c) (3 marks): One compound in crude oil contains 0.96 g of carbon atoms combined with 0.32 g of hydrogen atoms. Calculate the empirical formula of this compound. (relative at
  5. June 2025, Chemistry Paper 2 Foundation, Q4(b)(v) (3 marks): Calculate the percentage by mass of hydrogen in lithium hydroxide, LiOH. relative atomic mass of element % by mass of element = relative formula mass of compoun
  6. June 2025, Chemistry Paper 2 Foundation, Q6(c) (3 marks): One compound in crude oil contains 0.96 g of carbon atoms combined with 0.32 g of hydrogen atoms. Calculate the empirical formula of this compound. (relative at
  7. June 2024, Chemistry Paper 1 Higher, Q2(b) (3 marks): Calculate the percentage by mass of sodium in sodium carbonate, Na2CO3. percentage by mass of element = total relative atomic mass of element relative formula m
  8. June 2024, Chemistry Paper 1 Foundation, Q3(b) (3 marks): Chlorine reacts with silicon to form silicon chloride. A sample of silicon chloride contains 1.4 g of silicon atoms and 7.1 g of chlorine atoms. Calculate the e
  9. June 2024, Chemistry Paper 1 Foundation, Q6(b) (3 marks): Calculate the percentage by mass of sodium in sodium carbonate, Na2CO3. percentage by mass of element = total relative atomic mass of element relative formula m
  10. June 2024, Chemistry Paper 2 Higher, Q4(b)(ii) (4 marks): A hydrocarbon, CxHy , is burned in excess oxygen, forming 26.4 g of carbon dioxide and 5.4 g of water. The relative formula mass of CxHy is 78. Calculate the mo
  11. June 2024, Chemistry Paper 2 Foundation, Q4(d) (3 marks): Potassium bromide contains 32.8% potassium by mass. Calculate the mass of potassium and the mass of bromine in 500 g potassium bromide. (3) mass of potassium =
  12. June 2023, Chemistry Paper 1 Higher, Q6(a)(i) (1 mark): Use Figure 5 to deduce the empirical formula of compound S. (1)
  13. June 2023, Chemistry Paper 1 Foundation, Q4(c) (3 marks): 1.20 g of magnesium reacts completely with 3.55 g of chlorine to form magnesium chloride. Calculate the empirical formula of the magnesium chloride. (relative a
  14. June 2023, Chemistry Paper 2 Higher, Q5(a) (1 mark): What is the percentage by mass of nitrogen in ammonia, NH3? (relative atomic masses: H = 1.0, N = 14) (1) A 18% B 42% C 51% D 82%
  15. June 2023, Chemistry Paper 2 Higher, Q6(b) (4 marks): Hydrocarbon X was cracked to form one molecule of hexane, C6H14 , and one molecule of alkene Y. X → C6H14 + Y The relative formula mass of Y is 56. The empirica
  16. June 2022, Chemistry Paper 1 Higher, Q2(b) (3 marks): Calculate the percentage by mass of magnesium in magnesium carbonate, MgCO3. (relative atomic masses: C = 12.0, O = 16.0, Mg = 24.0) (3) percentage by mass of m
  17. June 2022, Chemistry Paper 1 Foundation, Q3(b) (3 marks): Aluminium reacts with bromine to form aluminium bromide. A sample of aluminium bromide contains 1.35 g of aluminium atoms and 12.00 g of bromine atoms. Calculat
  18. June 2022, Chemistry Paper 1 Foundation, Q6(b) (3 marks): Calculate the percentage by mass of magnesium in magnesium carbonate, MgCO3. (relative atomic masses: C = 12.0, O = 16.0, Mg = 24.0) (3) percentage by mass of m
  19. June 2022, Chemistry Paper 2 Higher, Q5(c) (4 marks): In another experiment, it was found that 1.24 g of phosphorus reacted completely with 1.60 g of oxygen to form phosphorus oxide. The relative formula mass of th
  20. June 2022, Chemistry Paper 2 Foundation, Q3(a)(iii) (1 mark): What is the relative formula mass of the compound in Figure 5? (relative atomic masses: H = 1.0, C = 12) (1) A 13 B 42 C 44 D 96
  21. June 2022, Chemistry Paper 2 Foundation, Q4(b)(iii) (3 marks): 34.4 % of the mass of iron chloride is iron. Calculate the mass of iron and the mass of chlorine in 125 g of iron chloride. (3) mass of iron = g mass of chlorin
  22. November 2021, Chemistry Paper 1 Higher, Q1(b) (2 marks): Dalton also investigated different gases. One of the gases that Dalton investigated was ethene. The structure of one molecule of ethene is shown in Figure 1. H
  23. November 2021, Chemistry Paper 1 Foundation, Q2(a)(iii) (2 marks): Calculate the relative formula mass of chromium oxide, Cr2O3. (relative atomic masses: O = 16, Cr = 52) (2) relative formula mass =
  24. November 2021, Chemistry Paper 1 Foundation, Q5(b) (2 marks): Dalton also investigated different gases. One of the gases that Dalton investigated was ethene. The structure of one molecule of ethene is shown in Figure 5. H
  25. November 2021, Chemistry Paper 2 Higher, Q5(b) (2 marks): The compound phosphorus oxychloride has the formula POCl3. Calculate the percentage by mass of chlorine in phosphorus oxychloride. (relative atomic masses: O =
  26. November 2021, Chemistry Paper 2 Higher, Q5(c) (3 marks): When iron reacts with chlorine, iron chloride is formed. Two possible equations for this reaction are A Fe + Cl2 → FeCl2 B 2Fe + 3Cl2 → 2FeCl3 In an experiment,
  27. November 2021, Chemistry Paper 2 Foundation, Q3(b) (3 marks): Tin reacts with chlorine to form tin chloride. A sample of tin chloride contains 1.19 g of tin and 1.42 g of chlorine. Calculate the empirical formula of this t
  28. November 2020, Chemistry Paper 1 Higher, Q2(a)(ii) (2 marks): Calculate the relative formula mass of copper carbonate, CuCO3 . (relative atomic masses: C = 12.0, O = 16.0, Cu = 63.5) (2) relative formula mass of CuCO3 =
  29. November 2020, Chemistry Paper 1 Higher, Q4(b)(ii) (3 marks): The equipment shown in Figure 5 can be used to find the mass of oxygen that combines with iron. lid crucible heat Figure 5 Describe how the equipment shown in F
  30. November 2020, Chemistry Paper 1 Higher, Q4(c) (4 marks): 2.24 g of iron combines with 0.96 g of oxygen to form an oxide of iron. Determine the formula of this oxide of iron and use it to complete the balanced equation
  31. November 2020, Chemistry Paper 1 Foundation, Q4(f) (3 marks): A titanium ore was analysed and found to contain 12 g of titanium atoms combined with 8.0 g of oxygen atoms. Calculate the empirical formula of this titanium co
  32. November 2020, Chemistry Paper 1 Foundation, Q6(a)(ii) (2 marks): Calculate the relative formula mass of copper carbonate, CuCO3 . (relative atomic masses: C = 12.0, O = 16.0, Cu = 63.5) (2) relative formula mass of CuCO3 =
  33. June 2019, Chemistry Paper 1 Higher, Q1(d) (3 marks): In an experiment, 3.5 g of element A reacted with 4.0 g of element G to form a compound. Calculate the empirical formula of this compound. (relative atomic mass
  34. June 2019, Chemistry Paper 1 Foundation, Q5(d) (3 marks): In an experiment, 3.5 g of element A reacted with 4.0 g of element G to form a compound. Calculate the empirical formula of this compound. (relative atomic mass
  35. June 2019, Chemistry Paper 2 Higher, Q1(c)(ii) (3 marks): Butane has the formula C4H10. Calculate the mass of carbon in 100 g of butane. Give your answer to three significant figures. (relative atomic masses: H = 1.00,
  36. June 2019, Chemistry Paper 2 Foundation, Q5(c)(ii) (3 marks): Butane has the formula C4H10. Calculate the mass of carbon in 100 g of butane. Give your answer to three significant figures. (relative atomic masses: H = 1.00,
  37. June 2018, Chemistry Paper 1 Foundation, Q2(a) (1 mark): The molecular formula of butene is C4H8. Which of the following is the empirical formula of butene? (1) A CH B CH2 C C4H8 D (CH2)4
  38. June 2018, Chemistry Paper 1 Foundation, Q2(b) (2 marks): Calculate the relative formula mass of butene, C4H8. (relative atomic masses: H = 1, C = 12) (2) relative formula mass
  39. June 2018, Chemistry Paper 2 Higher, Q3(a) (3 marks): Sodium metal tarnishes in air to form a layer of sodium oxide on its surface. 0.92 g of sodium combined with 0.32 g of oxygen in this oxide. Calculate the empir
  40. June 2018, Chemistry Paper 2 Foundation, Q6(a) (3 marks): Sodium metal tarnishes in air to form a layer of sodium oxide on its surface. 0.92 g of sodium combined with 0.32 g of oxygen in this oxide. Calculate the empir

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