Question

The percentage by weight of hydrogen in $H_2{O}_2$ is

• A. $5.88$
• B. $6.25$
• C. $25$
• D. $50$

Answer 1

Answer: (A)

Mol. mass of $H_2{O}_2=\left(2\times 1\right)+\left(2\times 16\right)=34$
Percentage of hydrogen $=\frac{2}{34}\times 100=5.88\%$