(a)
Strength of $H_{2}O_{2}$ in g/L $= \frac{68}{22.4} \times V$
Given strength of $H_{2}O_{2} = 30.36\ g/L$
Or $\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ V = \frac{30.36\ \times \ 22.4}{68}$
$\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ = 10\ volumes$