Question

The molecular mass of Na₂CO₃ is:

• A. 106
• B. 102 g
• C. 104 g
• D. 106g

Answer 1

The correct option is D

106g

Molecular mass is equal to the sum of the masses of its constituent atoms.

Therefore, the molecular mass of ${Na}_2{CO}_3=(2\times$ atomic mass of $Na$) $+(1\times$ atomic mass of $C)+(3\times$ atomic mass of $O)$

$=(2\times 23)+(1\times 12)+(3\times 16)$ = $46+12+48$ = $106g$