Question

The molecular mass of ${\text{SO}}_2$ is u.

• A. 32
• B. 48
• C. 64

Answer 1

The correct option is C 64

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> The molecular mass of a substance is the total mass of atoms in a molecule. <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> It is calculated by adding the atomic masses of all the atoms present in the molecule.

Sulphur dioxide $\left({\text{SO}}_2\right)$ is made up of one sulphur (S) and two oxygen (O) atoms. So, the molecular mass of ${\text{SO}}_2$ = atomic mass of S + (2 $\times$ atomic mass of O) = 32 + (2 $\times$ 16) = 64 u