The equation shows the reaction between zinc metal and hydrochloric acid.

zn(s) + 2hcl(aq) mc014-1.jpg zncl2(aq) + h2(g)

what is the theoretical yield of hydrogen gas if 5.00 mol of zinc are added to an excess of hydrochloric acid?
5.05 g
10.1 g
182 g
682 g

The balanced chemical reaction is written as:

Zn(s) + 2HCl(aq) = ZnCl2(aq) + H2(g)

We are given the amount of the reactant zinc to be used in the reaction This amount would be the starting point for the calculation. It is as follows:

5.00 mol Zn ( 1 mol H2 / 1 mol Zn ) (2.02 g H2 / 1 mol H2 ) = 10.1 g H2

Therefore, the correct answer is the second option.