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The formula unit mass of a substance is the:
relative atomic masses of atoms
sum of the atomic masses of all atoms in a formula unit of a compound
double the numerical value of the atomic mass
None of above

A

relative atomic masses of atoms

B

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

C

None of above

D

double the numerical value of the atomic mass

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Solution

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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 $\times$ 23) + (1 $\times$ 35.5) = 58.5 u

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