Question

Volume strength of hydrogen peroxide is $22.4 .$ What volume of this sample is required for the oxidation of $3.4 \,g$ of hydrogen sulphide?

• A. $50\, mL$
• B. $200\, mL$
• C. $100\, mL$
• D. $5\, mL$

Answer 1

Answer: (A)

$H _{2} S + H _{2} O _{2} \longrightarrow 2 H _{2} O + S$

$34 g H _{2} S$ reacts with $34 g H _{2} O _{2}$

$3.4 g H _{2} S$ reacts with $3.4 g H _{2} O _{2}$

Volume strength 22.4 means $22.4 \times 3.035=67.98 g / L$

$67.98 g$ are present in one litre. $3.4 g$ are present in

$\frac{1}{67.98} \times 3.4=0.05\, L =50\, mL$