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the mass of any substance relative to the amount of the substance; the mass of one mole of any substance, whether it is an atom, a molecule or a compound expressed in grams per mole (g.mol-1)
reactions that either simultaneously occur in both directions or that can be reversed by...
bonds that form between the hydrogen atom of one molecule and an oxygen, nitrogen or fluorine...
the ratio of the amount of a pure compound to the amount of substance containing that compound...