Question

The molecular mass of the compound ${\text{SO}}_2$ is:

• A. 16 u
• B. 48 u
• C. 32 u
• D. 64 u

Answer 1

The correct option is D 64 u

Molecular mass of a substance is the sum of the atomic masses of its constituent atoms.
Molecular mass of $S{O}_2$
= Atomic mass of S + 2$\times$(Atomic mass of O)
= $32+(2\times 16)$
= 64 u.