$2\mathrm{KMnO}{}_4+16\mathrm{HCl}\to 2\mathrm{KCl}+2\mathrm{MnCl}{}_2+5\mathrm{Cl}{}_2+8\mathrm{H}{}_2\mathrm{O}$. The number of moles of $\mathrm{Cl}{}_2$ evolved per mole of $\mathrm{KMnO}{}_4$ is

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