IGCSE Practice

Cambridge IGCSE·Co-ordinated Sciences 0654·Chemistry Relative Formula Mass The Mole
📋Key knowledge — Stoichiometry

Formulas & equations

  • Moles = mass (g) ÷ molar mass (g/mol)
  • Moles = volume (dm³) × concentration (mol/dm³)
  • Moles of gas at RTP = volume (dm³) ÷ 24 (at room temperature and pressure)
  • % yield = (actual yield ÷ theoretical yield) × 100
  • % purity = (mass of pure substance ÷ total mass) × 100
  • Empirical formula: simplest whole-number ratio of atoms. Molecular formula: actual ratio.

Key facts & rules

  • Avogadro's number: 1 mole contains 6.02 × 10²³ particles.
  • Molar mass: sum of Ar values from the periodic table for one formula unit.
  • Balancing equations: atoms must be equal on both sides — only coefficients can change, not formulae.
  • Limiting reagent: the reactant that runs out first, determining the maximum yield.
  • Excess reagent: the reactant that is not used up.

IGCSE Chemistry — Relative formula mass & the mole

8 Cambridge IGCSE 0654 questions on relative formula mass & the mole, across all three components.

About relative formula mass & the mole on IGCSE 0654

Every Cambridge IGCSE Co-ordinated Sciences 0654 question on relative formula mass & the mole (Stoichiometry, Chemistry), across all three exam components. Theory and alternative-to-practical come with full mark schemes; multiple choice is interactive — click an option to check it.

Theory

Papers 3 & 4 · 6 questions · Structured written questions, each with its full mark scheme.
Relative formula mass & the mole — Core theory questions2 total · Paper 3

Exercise 1 — IGCSE 0654 Jun 2025 Paper 32 Q6

Cambridge past paperCore10 marks Paper 32Jun 2025
IGCSE 0654 Jun 2025 Paper 32 Question 6 — Relative formula mass & the mole
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Mark scheme for IGCSE 0654 Jun 2025 Paper 32 Q6

Exercise 2 — IGCSE 0654 Jun 2025 Paper 33 Q6

Cambridge past paperCore10 marks Paper 33Jun 2025
IGCSE 0654 Jun 2025 Paper 33 Question 6 — Relative formula mass & the mole
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Mark scheme for IGCSE 0654 Jun 2025 Paper 33 Q6
Relative formula mass & the mole — Extended theory questions4 total · Paper 4

Exercise 3 — IGCSE 0654 Nov 2024 Paper 43 Q11

Cambridge past paperExtended11 marks Paper 43Nov 2024
IGCSE 0654 Nov 2024 Paper 43 Question 11 — Relative formula mass & the mole
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Mark scheme for IGCSE 0654 Nov 2024 Paper 43 Q11

Exercise 4 — IGCSE 0654 Nov 2024 Paper 43 Q5

Cambridge past paperExtended10 marks Paper 43Nov 2024
IGCSE 0654 Nov 2024 Paper 43 Question 5 — Relative formula mass & the mole
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Mark scheme for IGCSE 0654 Nov 2024 Paper 43 Q5

Exercise 5 — IGCSE 0654 Nov 2023 Paper 42 Q11

Cambridge past paperExtended8 marks Paper 42Nov 2023
IGCSE 0654 Nov 2023 Paper 42 Question 11 — Relative formula mass & the mole
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Mark scheme for IGCSE 0654 Nov 2023 Paper 42 Q11
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Multiple choice

Papers 1 & 2 · 1 question · Click an option (A–D) to check your answer instantly.
Relative formula mass & the mole — Extended multiple choice questions1 total · Paper 2

Exercise 1 — IGCSE 0654 March 2022 Paper 22 Q15

Cambridge past paperExtended1 mark Paper 22March 2022
IGCSE 0654 March 2022 Paper 22 Question 15 — Relative formula mass & the mole
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Correct answer: C
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Alternative to practical

Paper 6 · 1 question · Experiment-based questions, each with its full mark scheme.

Exercise 1 — IGCSE 0654 Oct/Nov 2022 Paper 62 Q4

Cambridge past paperPractical Paper 62Oct/Nov 2022
IGCSE 0654 Oct/Nov 2022 Paper 62 Question 4 — Relative formula mass & the mole
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Mark scheme for IGCSE 0654 Oct/Nov 2022 Paper 62 Q4
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More Stoichiometry subtopics