Mole Calculations
Mole calculations connect the symbolic equation to measurable quantities in the laboratory. These pages build from comparing masses and using the mole equation through to reacting mass calculations, percentage yield and atom economy.
These pages cover all four parts; the extra named ions, hydrated salts and limiting reagents follow with the supplementary set.
Revision Notes
5 revision notes, in the order the specification teaches them.
Comparing Masses of Substances
Revise relative atomic mass, relative formula mass and how chemists compare the masses of particles and compounds.
Start revising
Calculations involving Moles
Practise using amount of substance, mass and relative formula mass in the core mole calculation relationship.
Start revising
Calculations using Reacting Masses
Use balanced equations and mole ratios to calculate the mass of reactants needed or products formed.
Start revising
The Yield of a Reaction
Understand theoretical yield, actual yield and why percentage yield is often less than 100% in practical chemistry.
Start revising
Atom Economy
Revise how atom economy measures the proportion of reactant atoms converted into the desired product.
Start revisingSummary Map
Download, print and revise the key facts of this topic at a glance.
Summary map
Download, print and revise the key facts of this topic at a glance.
Mole Calculations Map
Cambridge International AS & A Level Chemistry · Topic 2 Mole calculations
The whole section on one A4 page: the unified atomic mass unit and relative masses, the mole, reacting masses, limiting and excess reagents and percentage yield.
© 2026 Online Learning System. For personal study: printing is allowed; editing, copying and redistribution are not.
Virtual Lessons
Recorded video lessons that teach the topic step by step.
The Virtual Lessons for Mole Calculations are being recorded.
MCQ Bank
Multiple-choice papers on this topic, marked the moment you submit.
The MCQ papers for Mole Calculations are being written.
SAQ Bank
Written, drawn and worked exam practice on this topic.
The exam practice papers for Mole Calculations are being written.
Revision Game
Match reagents to products, with your board's reagents and conditions.
The revision game for Mole Calculations is being built.
Study Cards
Pick a deck, then turn each card to check what you remember.
Specification
Every specification point in this topic, in the exam board's own words. Rate how confident you are with each one.
Cambridge no longer issues a data booklet: the data you need are given in each question, and the syllabus has a Data section.
Self-assessment · 12 points
Sign in to rate how confident you feel about each point. Your ratings are saved to your account, follow you to any device, and appear beside your KASP analytics, kept apart from your marks.
2.1.1
2.1.2
2.2.1
2.3.4
2.4.1
Keep this note — free
Save your progress across every Cambridge topic. A free account remembers which topics you have covered, saves your question scores, and syncs across your phone and laptop.
- Track every topic you have finished
- Keep your practice-question scores
- No payment, no card, free forever
Already registered? Log in