Answer
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Work Step by Step
The molar mass of a compound is the mass of one mole of that compound and is expressed in grams per mole (g/mol). It is calculated by summing the atomic masses of all the atoms in the compound, according to their stoichiometric coefficients in the chemical formula. The empirical formula mass, on the other hand, is the sum of the atomic masses of the atoms in the empirical formula of the compound. The empirical formula represents the simplest whole-number ratio of the elements in the compound.
The molar mass and empirical formula mass are the same when the compound's empirical formula is the same as its molecular formula (e.g., H2O, N2, O3). They are different when the compound's molecular formula contains more than one empirical formula unit. In such cases, the molar mass is related to the empirical formula mass by a whole-number multiple, which is the number of empirical formula units in the molecular formula.
