Mr is the mass of a molecule relative to 1/12 the mass of an atom of the most common isotope of carbon.

Name: Mr is the mass of a molecule relative to 1/12 the mass of an atom of the most common isotope of carbon.
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This is the definition of the molecular weight or molecular mass of a substance, where the mass of each atom in the molecule is summed up and expressed relative to the mass of a carbon-12 atom (1/12 of its mass).

Mr Is the Mass of a Molecule Relative to 1/12