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What we’re serious about may be the atomic mass. Atomic mass is similar to molecular mass, which is also similar to molar mass. It's the mass of 1 mole of that element, in grams. So 1 mole of lithium is 6.941 grams.That is why the Arrhenius definition doesn’t hold up on the Brønsted-Lowry definition. We gained’t go into that, but in case you