Question

Weight of $H_2{O}_2$ present in $560$ ml of $20$ volume $H_2{O}_2$ solution is approximately:

• A. 69 g
• B. 34 g
• C. 32 g
• D. 3.4 g

Answer 1

The correct option is B 34 g

Volume strength is referred to the volume of oxygen gas liberated from 1 mL volume of $2H_2{O}_2$ solution.

According to the reaction

$2H_2{O}_2\to 2H_{2}O+O_2$

$1mol$ ($34g$) of $H_2{O}_2$ produces $0.5$ mol or $11200mL$ of $O_2$.

$20mL$ oxygen will be obtained from :

$\frac{34}{11200}\times 20=0.061g$

Therefore, $0.061g$ of $H_2{O}_2$ in $1mL$ gives 20 volume $2H_2{O}_2$

Therefore in $560mL$ solution, amount of $H_2{O}_2$ present = $560\times 0.061=34.16g$

Option B is correct.