An 0.7700 mol sample of an ionic compound has a mass of 126.4 g. Determine the number of formula units of the compound that are present. Express answer in scientific notation.

Explanation:

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In this case, for the given ionic compound, it is said we have 0.7700 mol in a sample which also weights 126.4 g, it means that number of formula units or molar mass is then:

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