AQA GCSE Chemistry · 8462
Specification 4.3.1.2 · Paper 1
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GCSE Chemistry · key term
The proportion of a compound's total mass contributed by a specified element, expressed as a percentage.
Used by AQA and Edexcel
Specification 4.3.1.2 · Paper 1
Specification 1.43 · Paper 1, Paper 2
The proportion of a compound’s total mass contributed by a particular element, expressed as a percentage.
Revise: Relative Formula Mass and Percentage by MassPercentage by mass answers the question: what fraction of the compound’s total mass comes from this element?
For percentage by mass, use the total relative mass of the chosen element in the formula, not just one value.
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