Chemistry - Redox Reactions Question with Solution | TestHub

A $20.0 \mathrm{mL}$ solution containing $0.2 \mathrm{g}$ impure ${\mathrm{H}}_2{\mathrm{O}}_2$ reacts completely with $0.316 \mathrm{g}$ of ${\mathrm{KMnO}}_4$ in acid solution. The purity of ${\mathrm{H}}_2{\mathrm{O}}_2$ (in $\mathrm{\%}$) is______  (mol. wt. of ${\mathrm{H}}_2{\mathrm{O}}_2=34$; mol. wt. of ${\mathrm{KMnO}}_4=158$)