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Relative Formula Mass

AQA AS-level ChemistryAmount of SubstanceLesson 3 of 33

The relative formula mass is the mass of a formula unit compared to 1/12th the mass of a carbon-12 atom.

The relative formula mass of a formula unit is the sum of the relative atomic masses of the elements in the empirical formula.

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Key terms in this lesson

Empirical formula
The simplest whole number ratio of atoms of each element in a compound.

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