Small quantities of chlorine can be prepared in the laboratory by the reaction described by the equation                MnO2(s) + 4 HCl(aq) -> MnCl2(aq) + Cl2(g) + 2 H2O(l) How much MnO2(s) (in g) should be added to excess HCl(aq) to obtain 212 mL of Cl2(g) at 25℃ and 755 Torr?

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Mole Concept

Mole concept is a method to determine the amount of any substance that consists of some elemental particles using a grouping unit called ‘mole’. The mole concept enables one to handle the large amount of small elementary particles. The mole concept can be used in many calculations related to mole calculation, molar amount, mole ratio, and so on, which are significant in chemistry.