Answer these questions based on this reaction and the following information Mn(s) + 2 HCl(aq) ® MnCl2(aq) + H2(g) DH = -221 kJ 115.0 g of manganese is placed in a 1.25 L of a 3.50 M solution of hydrochloric acid. A.What is the theoretical mass of hydrogen gas created in the reaction?   B.If 33.6 L of hydrogen gas was measured to have formed at STP what is the percent yield of this reaction? Hint: You will need to convert this amount to grams!

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