Question

The formula unit mass of a substance is the:

A

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

B

relative atomic masses of atoms

C

double the numerical value of the atomic mass

D

none of above

Medium

Solution

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Correct option is
A

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

The formula mass of a substance is defined as the sum of the atomic masses of constituent atoms in a compound. This is generally used for compounds which do not contain discrete molecules, but ions as their constituent units. Example: NaCl (sodium chloride) made of sodium and chlorine ions. Formula unit mass of NaCl = (1 23) + (1 35.5) = 58.5 u

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