Relative atomic mass (Ar)

Key term for OCR GCSE Chemistry B, used in Stoichiometry calculations.

Definition

The average mass of an atom of an element compared to 1/12th the mass of an atom of carbon-12.

Exam Context

Relative atomic mass (Ar) appears in OCR GCSE Chemistry B revision content for Chemical analysis, especially Stoichiometry calculations and Conservation of mass.

Chemical analysis Stoichiometry calculations Conservation of mass

Found in Revision Notes

Chemical analysis

Conservation of mass

Stoichiometry calculations • Conservation of mass

Revise note

Related Key Terms

Closed system Law of conservation of mass Non-enclosed (open) system Precipitate

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Reactants

Relative formula mass (Mr)