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Chlorine can be prepared in the laboratory by the reaction of manganese dioxide with hydrochloric acid, HCl(aq), as described by the chemical equation MnO2(s) + 4HCl(aq) → MnCl2(aq) + 2H2O(l) + Cl2(g) How much MnO2(s) should be added to excess HCl(aq) to obtain 235 mL Cl2(g) at 25 °C and 785 Torr?