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 305 mL Cl2⁢(g) at 25 °C and 755 Torr?

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