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HomeCXC CSEC ChemistryThe Mole Concept and Stoichiometry
CXC · CSEC · Chemistry

The Mole Concept and Stoichiometry
Practice Questions

20 CXC CSEC Chemistry questions on The Mole Concept and Stoichiometry, each with instant feedback and a full examiner-style mark scheme.

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Try 2 sample questions on The Mole Concept and Stoichiometry

Question 1 · 1 mark · Difficulty 1/3

The Avogadro constant is approximately

  1. 6.02 × 10²³
  2. 6.02 × 10⁻²³
  3. 6.02 × 10²⁴
  4. 6.02 × 10²²
Show answer & explanation
✓ Answer: A6.02 × 10²³
02 × 10²³. Award 1 mark for recalling the correct value. B is incorrect — the exponent should be positive, not negative. C is incorrect — the exponent is too large by one power. D is incorrect — the exponent is too small by one power.
Question 2 · 1 mark · Difficulty 2/3

A student at a secondary school in Trinidad is asked to calculate the number of moles of sodium hydroxide (NaOH) in 80 g of the compound. (Relative atomic masses: Na = 23, O = 16, H = 1) What is the correct answer?

  1. 0.5 mol
  2. 2.0 mol
  3. 4.0 mol
  4. 8.0 mol
Show answer & explanation
✓ Answer: B2.0 mol
0 mol. Award 1 mark for correct calculation: Molar mass of NaOH = 23 + 16 + 1 = 40 g/mol; Number of moles = 80 ÷ 40 = 2.0 mol. A is incorrect — this results from dividing by 160 (doubled molar mass). C is incorrect — this results from multiplying instead of dividing. D is incorrect — this confuses mass with moles.
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20 questions · 25 min · free

CXC CSEC Chemistry: The Mole Concept and Stoichiometry FAQ

How many CXC CSEC Chemistry questions on The Mole Concept and Stoichiometry are there on Kramizo?
Kramizo currently has 20 exam-board-aligned practice questions on The Mole Concept and Stoichiometry for CXC CSEC Chemistry, 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 CXC 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 CXC CSEC students preparing for Chemistry?
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 The Mole Concept and Stoichiometry practice with other Chemistry topics or even switch to a totally different CXC 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 The Mole Concept and Stoichiometry questions aligned to the official CXC CSEC Chemistry syllabus?
Every question is written against the published CXC CSEC Chemistry specification, including the exact command words (state, describe, explain, calculate, evaluate, etc.), mark allocations, and difficulty tier you'd see on a real CXC 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 CXC.
How is The Mole Concept and Stoichiometry typically tested on CXC CSEC Chemistry papers?
The Mole Concept and Stoichiometry appears across multiple question types on real CXC CSEC Chemistry 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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