The formula unit mass of $N a_{2} O$ is u.

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Solution

The correct option is C 62
Formula unit mass is the sum of the masses of all atoms in a formula unit of a compound.

${Na}_{2} O$ is constituted by two ${Na}^{+}$ and one $O^{2 -}$ ions.

Hence, the formula unit mass of ${Na}_{2} O$ = (2 $\times$ atomic mass of Na) + atomic mass of O = (2 x 23) + 16 = 62 u.

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