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CIE · IGCSE · Co-ordinated Science (Double Award)

Moles, molar mass and calculations from equations
Practice Questions

20 CIE IGCSE Co-ordinated Science (Double Award) questions on Moles, molar mass and calculations from equations, each with instant feedback and a full examiner-style mark scheme.

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Try 2 sample questions on Moles, molar mass and calculations from equations

Question 1 · 1 mark · Difficulty 1/3

What is the molar mass of sulfuric acid, H₂SO₄? (Relative atomic masses: H = 1, S = 32, O = 16)

  1. B) 49 g/mol
  2. D) 80 g/mol
  3. A) 96 g/mol
  4. C) 98 g/mol
Show answer & explanation
✓ Answer: D — C) 98 g/mol
Molar mass = (2 × 1) + (1 × 32) + (4 × 16) = 2 + 32 + 64 = 98 g/mol. Option A omits the hydrogen atoms. Option B is half the correct molar mass, a halving error. Option D uses only one oxygen and omits hydrogen, corresponding to SO₄ with incorrect arithmetic.
Question 2 · 1 mark · Difficulty 1/3

How many moles are present in 11 g of carbon dioxide, CO₂? (Relative atomic masses: C = 12, O = 16)

  1. A) 0.50 mol
  2. C) 0.25 mol
  3. D) 0.44 mol
  4. B) 4.00 mol
Show answer & explanation
✓ Answer: B — C) 0.25 mol
Molar mass of CO₂ = 12 + (2 × 16) = 44 g/mol. Moles = mass ÷ molar mass = 11 ÷ 44 = 0.25 mol. Option A uses a molar mass of 22, confusing CO₂ with a molar volume value. Option B inverts the calculation (44 ÷ 11). Option D confuses the number of grams with the number of moles and divides incorrectly.
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CIE IGCSE Co-ordinated Science (Double Award): Moles, molar mass and calculations from equations FAQ

How many CIE IGCSE Co-ordinated Science (Double Award) questions on Moles, molar mass and calculations from equations are there on Kramizo?
Kramizo currently has 20 exam-board-aligned practice questions on Moles, molar mass and calculations from equations for CIE IGCSE Co-ordinated Science (Double Award), with new questions added every week. Each question gives you instant feedback and a full examiner-style mark scheme that tells you exactly what would earn marks on a real CIE paper. The questions span the full difficulty range — from straightforward recall (level 1) right up to multi-step reasoning and evaluation (level 3) — so the bank works for first-pass revision and final exam-week stress testing alike.
Is Kramizo free for CIE IGCSE students preparing for Co-ordinated Science (Double Award)?
Yes — completely free. Every student gets 45 questions a day on the free plan, with no card required and no trial countdown. That free quota works across every subject and every topic in our bank, so you can mix Moles, molar mass and calculations from equations practice with other Co-ordinated Science (Double Award) topics or even switch to a totally different CIE subject without paying anything. Kramizo's optional Pro plan removes the daily cap and adds detailed progress analytics, but the free tier is the real product — used by thousands of GCSE, IGCSE and CSEC students.
Are the Moles, molar mass and calculations from equations questions aligned to the official CIE IGCSE Co-ordinated Science (Double Award) syllabus?
Every question is written against the published CIE IGCSE Co-ordinated Science (Double Award) specification, including the exact command words (state, describe, explain, calculate, evaluate, etc.), mark allocations, and difficulty tier you'd see on a real CIE paper. Explanations are written in the style of official examiner mark schemes — they tell you what is being awarded marks and why distractors are wrong, not just whether you got it right. The bank is continually refined to match the latest syllabus updates from CIE.
How is Moles, molar mass and calculations from equations typically tested on CIE IGCSE Co-ordinated Science (Double Award) papers?
Moles, molar mass and calculations from equations appears across multiple question types on real CIE IGCSE Co-ordinated Science (Double Award) papers — most commonly as multiple-choice questions in the objective section, structured short-answer questions in the main paper, and occasionally as part of an extended response. Kramizo's practice bank reflects that mix: 4-option MCQs, true/false statements, fill-in-the-blank key terms, multi-select questions, and ordering questions. Working through the bank gives you exposure to every question style examiners actually use.

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