Aqueous HCl reacts with $\mathrm{MnO}_2(\mathrm{s})$ to form $\mathrm{MnCl}_2(\mathrm{aq}), \mathrm{

Question

Aqueous HCl reacts with $\mathrm{MnO}_2(\mathrm{s})$ to form $\mathrm{MnCl}_2(\mathrm{aq}), \mathrm{Cl}_2(\mathrm{~g})$ and $\mathrm{H}_2 \mathrm{O}(\mathrm{l})$. What is the weight (in g ) of $\mathrm{Cl}_2$ liberated when 8.7 g of $\mathrm{MnO}_2(\mathrm{s})$ is reacted with excess aqueous HCl solution?
 (Given Molar mass in $\mathrm{g} \mathrm{mol}^{-1} \mathrm{Mn}=55, \mathrm{Cl}=35.5, \mathrm{O}=16, \mathrm{H}=1$ )

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