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Formula Mass

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Question

Calculate the formula unit mass of ${CaCO}_{3}$ (Atomic mass of $C$ = 12 u, $Ca$ = 40 u, $O$ = 16 u)

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Solution

Formula unit mass is defined as the sum of the atomic mass of all atoms in the formula unit of the compound.
Formula unit mass of ${CaCO}_{3}$ =Mass of $Ca$ +Mass of $C$ + Mass of $O$
= $40 u + 12 u + 16 u \times 3$
= $100 u$

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