Aqueous HCl reacts with \( \mathrm{MnO_2 (s)} \) to form \( \mathrm{MnCl_2 (aq)} \), \( \mathrm{Cl_2 (g)} \) and \( \mathrm{H_2O (l)} \). What is the weight (in \( \mathrm{g} \)) of \( \mathrm{Cl_2} \) liberated when \( 8.7 \,\mathrm{g} \) of \( \mathrm{MnO_2 (s)} \) is reacted with excess aqueous HCl solution?
(Given Molar mass in \( \mathrm{g\,mol^{-1}} \) \( \mathrm{Mn} = 55 \), \( \mathrm{Cl} = 35.5 \), \( \mathrm{O} = 16 \), \( \mathrm{H} = 1 \))
