Question

which types of compound fomula unit mass is used​

Answer 1

Answer:

Formula unit mass is the sum of the atomic masses of all atoms present in one formula unit of the compound. It is used for ionic compounds because they do not exist as molecules.

Explanation:

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Answer 2

Answer:

The formula mass of a substance is defined as the sum of the atomic masses of constituent atoms in an ionic compound. This is generally used for ionic compounds which do not contain discrete molecules, but ions as their constituent units.