Consider the following equations :
$$
2 \mathrm{Fe}^{2+}+\mathrm{H}_2 \mathrm{O}_2 \rightarrow x A+y B
$$
(in basic medium)
$$
2 \mathrm{MnO}_4^{-}+6 \mathrm{H}^{+}+5 \mathrm{H}_2 \mathrm{O}_2 \rightarrow x^{\prime} \mathrm{C}+y^{\prime} \mathrm{D}+z^{\prime} \mathrm{E}
$$
(in acidic medium)
The sum of the stoichiometric coefficients
$\mathrm{x}, \mathrm{y},, \mathrm{x}^{\prime}, \mathrm{y}^{\prime}$ and $\mathrm{z}^{\prime}$ for products $\mathrm{A}, \mathrm{B}, \mathrm{C}, \mathrm{D}$ and E , respectively, is
