Question

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


Zn(s) + 2HCl(aq) Right arrow. 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

Answer 1

Balanced equation shows 1 mol Zn → 1 mol H2. So 5.00 mol Zn gives 5.00 mol H2.

Mass H2 = 5.00 mol × 2.016 g/mol = 10.08 g ≈ 10.1 g.

Answer: 10.1 g.