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HomeCXC CSEC ChemistryThe Mole Concept and Avogadro's Number
CXC · CSEC · Chemistry

The Mole Concept and Avogadro's Number
Practice Questions

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

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Try 2 sample questions on The Mole Concept and Avogadro's Number

Question 1 · 1 mark · Difficulty 1/3

What is the numerical value of Avogadro's number?

  1. 6.02 × 10²³
  2. 6.02 × 10²²
  3. 6.02 × 10²⁴
  4. 6.22 × 10²³
Show answer & explanation
✓ Answer: A6.02 × 10²³
02 × 10²³. Award 1 mark for correctly identifying Avogadro's number. B is incorrect — the exponent is too small (10²²). C is incorrect — the exponent is too large (10²⁴). D is incorrect — the coefficient is wrong (6.22 instead of 6.02).
Question 2 · 1 mark · Difficulty 1/3

A student in a Barbados school laboratory measures out 18 g of water. How many moles of water (H₂O) does this represent? (H = 1, O = 16)

  1. 0.5 mol
  2. 1.0 mol
  3. 1.8 mol
  4. 18 mol
Show answer & explanation
✓ Answer: B1.0 mol
0 mol. Award 1 mark for correct calculation: Molar mass of H₂O = (2 × 1) + 16 = 18 g/mol. Moles = mass/molar mass = 18/18 = 1.0 mol. A is incorrect — this would be 9 g of water. C is incorrect — student divided incorrectly. D is incorrect — student confused mass with moles.
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CXC CSEC Chemistry: The Mole Concept and Avogadro's Number FAQ

How many CXC CSEC Chemistry questions on The Mole Concept and Avogadro's Number are there on Kramizo?
Kramizo currently has 20 exam-board-aligned practice questions on The Mole Concept and Avogadro's Number 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 Avogadro's Number 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 Avogadro's Number 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 Avogadro's Number typically tested on CXC CSEC Chemistry papers?
The Mole Concept and Avogadro's Number 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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