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Relative Molecular Mass

The relative molecular mass is the weighted mean mass of a molecule compared to 1/12th the mass of a carbon-12 atom.
The relative molecular mass is given the symbol Mr.The term relative molecular mass is used for discrete molecules which are made of covalently bonded atoms.

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Specification: AQA Chemistry (7404), AS-level, 3.1.2.1 Relative atomic mass and relative molecular mass. Topic: Amount of Substance.

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