In acidic medium, $\mathrm{KMnO}{}_4$ reacts with $\mathrm{H}{}_2\mathrm{O}{}_2$ as $2\mathrm{MnO}{}_4{}^{-}+5\mathrm{H}{}_2\mathrm{O}{}_2+6\mathrm{H}{}^{+}\to 2\mathrm{Mn}{}^{2+}+5\mathrm{O}{}_2+8\mathrm{H}{}_2\mathrm{O}$. The number of moles of $\mathrm{O}{}_2$ released per mole of $\mathrm{KMnO}{}_4$ is

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