a) Define formula unit mass.
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In an earlier chapter, we described the development of the atomic mass unit, the concept of average atomic masses, and the use of chemical formulas to represent the elemental makeup of substances. These ideas can be extended to calculate the formula mass of a substance by summing the average atomic masses of all the atoms represented in the substance’s formula.
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The formula unit mass of a substance is a sum of the atomic masses of all atoms in a formula unit of a compound.
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