AQA GCSE Combined Science Trilogy · 8464
Specification 5.3.1.2 · Paper 3
Revise: Relative Formula MassPercentage by mass tells you how much of a compound’s mass comes from a particular element.
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GCSE Combined Science · key term
The percentage of a compound’s total mass contributed by a particular element.
Used by AQA and Edexcel
Specification 5.3.1.2 · Paper 3
Revise: Relative Formula MassPercentage by mass tells you how much of a compound’s mass comes from a particular element.
Specification Calculations involving masses · Paper 3, Paper 4
An element’s percentage by mass tells you how much of the compound’s total mass comes from that element.
For percentage by mass, put the element’s total contribution above the compound’s Mᵣ. Your answer must lie between 0% and 100%.
For percentage by mass, include all atoms of the chosen element in the numerator and the whole compound in the denominator.
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