Moles & Calculations — GCSE Chemistry Revision
Revise Moles & Calculations for GCSE Chemistry. Step-by-step explanation, worked examples, common mistakes and exam-style practice aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP.
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Go to Amount of SubstanceWhat is Moles & Calculations?
Moles Calculations are much easier when you treat the mole as a counting unit, not a mysterious extra topic. The usual GCSE route is: calculate formula mass, use moles = mass / Mr, then move between moles and particle numbers or reacting amounts. Students often panic because they rush to the calculator before writing the conversion step that proves what the numbers mean.
Board notes: AQA, Edexcel and OCR all cover the same Chemistry foundations here, but the style of practical setup, calculation wording, and emphasis on extended explanation can vary by paper.
Step-by-step explanationWorked example
Question focus: 'Find the number of moles in 18 g of water.' Step 1: calculate Mr of H2O = 18. Step 2: use moles = mass / Mr = 18 / 18 = 1 mol. If the question continues into particles, then multiply by Avogadro's number. The key is writing each conversion step clearly before doing the arithmetic.
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Targeted practice plan
- 1Write the key particles, formula, or equation for Moles & Calculations, then apply it to one unfamiliar example.
- 2Do one method or calculation question and annotate every unit, state symbol, or balancing step before marking it.
- 3Check the answer for chemistry-specific precision: have you explained why the particles behave that way, not just named the trend?
Common mistakes
- 1Using addition or multiplication when the question needs mass divided by Mr.
- 2Starting a multi-step reacting-mass problem before balancing the equation.
- 3Dropping units or forgetting to label which substance the mole value belongs to.
Moles & Calculations exam questions
Exam-style questions for Moles & Calculations with mark-scheme style solutions and timing practice. Aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP specifications.
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Step-by-step method
Step-by-step explanation
4 steps · Worked method for Moles & Calculations
Core concept
Moles Calculations are much easier when you treat the mole as a counting unit, not a mysterious extra topic. The usual GCSE route is: calculate formula mass, use moles = mass / Mr, then move between m…
Frequently asked questions
What is the first thing I should do in a mole calculation?
Work out the relative formula mass if it is not already given. That gives you the conversion you need from mass to moles.
Why do mole questions feel harder than they are?
Because several linked steps can appear in one question. If you label each step clearly, the method becomes much easier to follow and mark.