The action of zinc on hydrochloric acid yielded 4.48 liters of gas. what mass of zinc has reacted?

Let’s find the amount of substance H2.

n = V: Vn.

n = 4.48 L: 22.4 L / mol = 0.2 mol.

Let’s compose the reaction equation, find the quantitative ratios of substances.

Zn + 2HCl = ZnCl2 + H2 ↑.

According to the reaction equation, there is 1 mole of Zn per 1 mole of H2. Substances are in quantitative ratios 1: 1.

n (Zn) = n (H2) = 0.2 mol.

Let’s find the mass of Zn.

M (Zn) = 65 g / mol.

m = n × M.

m = 65 g / mol × 0.2 mol = 13 g.

Answer: 13 g.