21/01/2019 · +(2) = g/mol So, the molar mass of carbon dioxide is g/mol. Molar Mass In a Nutshell. The molar mass of a substance tells you how much one mole of that substances weighs. A 'mole" is a counting number that corresponds to the number × 10 like the words "million" and "billion", a "mole" specifies a particular quantity of something.
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