Weegy: Hydrogen gas is produced when zinc reacts with hydrochloric acid. [ [ If the actual yield of this reaction is 85%,
380 g of zinc are needed to produce 112L of H2 at STP.
-Start with a balanced chemical equation
Zn + 2 HCl - > ZnCl2(aq) + H2
112L H2 x (1 mol H2 / 22.4 L H2) x (1 mol Zn / 1 mol H2) x (65.4 g Zn / 1 mol Zn) = 327 g Zn
But that is if you had 100% yield. Only 85% of the Zn that was present produced H2, so divide 327 by ... (More)