Question

What is the percentage by mass of sulfur in $H_{2}S{O}_4$?

• A. $16\%$
• B. $33\%$
• C. $36\%$
• D. $42\%$

Answer 1

The correct option is B $33\%$

The molecular weight of Sulphuric acid is 98 grams. [($1$ $\times$ $2$) $+$ $32$ $+$ ($16$ $\times$ $4$)]

Thus, each mole of $H_{2}S{O}_4$ contains $32$ grams of $Sulphur$

Thus mass percentage of $Sulphur$ is equal to $\frac{32}{98}$ $\times$ $100$, which is almost equal to $33$%

Thus option B is the correct answer.