Calculate the formula unit masses of $ZnO, Na_2O, K_2CO_3$ given atomic masses of $Zn=65\,u, Na=23\,u, K=39\,u, C=12\,u$ and $O=16\,u$.
- A$4\,u, 18\,u$ and $24\,u$
- B$81\,u, 62\,u$ and $138\,u$
- C$36\,u, 71\,u$ and $108\,u$
- D$12\,u, 24\,u$ and $36\,u$
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