When the mass of a substance produced in a reaction must be calculated,first its number of moles is determined using mole ratios,and then Avogadro's number is used to convert moles to grams.

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To calculate the mass of a substance produced in a reaction, the number of moles is first determined using mole ratios, and then the molar mass of the substance (not Avogadro's number) is used to convert moles to grams.

When the Mass of a Substance Produced in a Reaction