Question

The percentage of phosphorus in $H_{3}P{O}_4$ is:

• A. $22.22\%$
• B. $31.63\%$
• C. $28.57\%$
• D. $45\%$

Answer 1

The correct option is B $31.63\%$

We know, gram molar mass of $H_{3}P{O}_4=98\text{g}$
Mass of phosphorus in $H_{3}P{O}_4=31\text{g}$
% of phosphorus $=\frac{\text{Mass of element}}{\text{Mass of the compound}}\times 100=31.63\%$