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GCSE Combined Science · key term
The ratio of the amounts, in moles, of two substances in a reaction, given by their balancing numbers in the balanced symbol equation.
Used by AQA
Specification 5.3.2.2, 5.3.2.3 · Paper 3
Revise: Amounts of Substances in EquationsThe balancing numbers give a mole ratio, not a mass ratio. Different substances have different masses per mole, so equal amounts in moles do not usually have equal masses.
The relative proportions of substances expressed as amounts in moles.
Use the balancing numbers as a mole ratio, not a mass ratio.
Show all three stages: known mass → moles → mole ratio → required mass.
Convert every mass to moles before finding the ratio: mass ratios are not generally the same as mole ratios.
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