The equation shows the reaction between zinc metal and hydrochloric acid. Zn times s plus 2 HCl aq rightarrow ZnCl sub 2 times aq plus cap h sub 2 of g What is the theoretical yield of hydrogen gas if 5 point 0 0 mol of zinc are added to an excess of hydrochloric acid?

The balanced equation shows that 1 mol of zinc produces 1 mol of hydrogen gas. Therefore, 5.00 mol Zn produces 5.00 mol H₂. Using hydrogen’s molar mass, 2.016 g/mol, the theoretical yield is 5.00 × 2.016 = 10.08 g, which rounds to 10.1 g. The correct choice is A, 10.1 g.

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