Last updated on Sep 20, 2026

Using Moles to Balance Equations (AQA GCSE Chemistry): Flashcards

📚Flashcards

Revision Notes Model Answers Quizzes Flashcards Exam Questions

Using Moles to Balance Equations

Sign up to keep revising.Create a free account to study more flashcards and track your progress.

Practise the cards

10 cards from this deck

Show

Steps to balance equations using moles

Mass→moles, find ratio, balance equation

1st step: mole-balance method

Convert mass of each substance to moles

2nd step: mole-balance method

Find simplest ratio of moles

3rd step: mole-balance method

Use ratio to balance equation

Moles of $N_2$ from 5.6g ( $Mr$ =28)

0.2 moles

Moles of $H_2$ from 1.2g ( $Mr$ =2)

0.6 moles

Moles of $NH_3$ from 6.8g ( $Mr$ =17)

0.4 moles

Simplify mole ratios by dividing by

Smallest mole amount

$N_2:H_2:NH_3$ ratio (from 0.2:0.6:0.4)

1:3:2

Balanced equation: $N_2 + H_2 \rightarrow NH_3$

$N_2 + 3H_2 \rightarrow 2NH_3$

Explore AQA GCSE Chemistry Revision Notes by Topics

Measurement, Mass & Equations

Calculating Mass of Substances

Yield & Atom Economy

Concentration of Solutions

Amount of Substance & Gas Volume

Explore AQA GCSE Chemistry Model Answers by Topics

Measurement, Mass & Equations

Calculating Mass of Substances

Yield & Atom Economy

Concentration of Solutions

Amount of Substance & Gas Volume

Explore AQA GCSE Chemistry Quizzes by Topics

Measurement, Mass & Equations

Calculating Mass of Substances

Yield & Atom Economy

Concentration of Solutions

Amount of Substance & Gas Volume

Explore AQA GCSE Chemistry Exam Questions by Topics

Measurement, Mass & Equations

Calculating Mass of Substances

Yield & Atom Economy

Concentration of Solutions

Amount of Substance & Gas Volume

Join 100,000+ GCSE students studying Flashcards with us.

Select your subjects, and get access to A+ resources today.