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3.2.3 Using moles to balance equations (HT only)
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From masses to balancing numbers

From masses to balancing numbers

Particle diagram showing two magnesium atoms reacting with one oxygen molecule to form two magnesium oxide formula units, giving the mole ratio 2 to 1 to 2

The balancing numbers in a chemical equation show the mole ratio in which substances react and form. For example, 2Mg+O2→2MgO2\text{Mg} + \text{O}_2 \rightarrow 2\text{MgO}2Mg+O2​→2MgO gives the ratio 2:1:22:1:22:1:2.

3.2.3 Using moles to balance equations (HT only) Lesson

  1. GCSE
  2. /Chemistry
  3. /3.2.3 Using moles to balance equations (HT only)

Step-by-step lessons on AQA GCSE Chemistry 3.2.3 Using moles to balance equations (HT only). Each one builds up to exam-style questions. Nail the core quantitative topics — moles, balancing equations and calculations — early on, since they underpin higher-tier questions across every paper and topic.

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