Question

Mass percentage of sulphur in sulphuric acid is .

• A. 32.6%
• B. 50 %
• C. 80 %

Answer 1

The correct option is A 32.6%

In sulphuric acid ($H_{2}S{O}_4$), the atomic mass of S is 32 u, atomic mass of H is 1 u, atomic mass of O is 16 u.

Total mass of $H_{2}S{O}_4$

$=\left(2x1u\right)+32u+\left(4x16u\right)=98u$

Mass % of sulphur in $H_{2}S{O}_4$

$=\frac{\mathrm{Mass}\mathrm{of}\mathrm{sulphur}\mathrm{in}\mathrm{sulphuric}\mathrm{acid}}{\mathrm{Total}\mathrm{mass}\mathrm{of}\mathrm{sulphuric}\mathrm{acid}}=\frac{32}{98}=32.65\%$