The formula unit mass of a substance is-

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a sum of atomic numbers of all atoms

Formula based method to obtain atomic masses

a sum of the molecular masses of all atoms in a formula unit of a compound.

a sum of the atomic masses of all atoms in a formula unit of a compound.

answer is A.

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Detailed Solution

The formula unit mass of a substance is defined as the sum of the atomic masses of all atoms in a formula unit of a compound.
Formula unit mass is calculated in a similar manner to that of molecular mass.
The only difference between formula unit mass and molecular mass is that the word formula unit is used for those substances whose constituent particles are ions.

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