Calculate the mass of zinc chloride if it is known that 5 g of metallic zinc were consumed in the reaction with hydrochloric acid.

Given: m (Zn) = 5 g;

Find: m (ZnCl2) -?

1. Let’s write the equation of interaction of hydrochloric acid with zinc:

2HCl + Zn = ZnCl2 + H2 ↑;

2.Calculate the chemical amount of zinc:

n (Zn) = m (Zn): M (Zn) = 5: 65 = 0.0769 mol;

3. according to the reaction equation, 1 mol of zinc gives 1 mol of zinc chloride:

n (ZnCl2) = n (Zn) = 0.0769 mol;

4.Calculate the mass of the zinc chloride obtained:

m (ZnCl2) = n (ZnCl2) * M (ZnCl2);

M (ZnCl2) = 65 + 2 * 35.5 = 100.5 g / mol;

m (ZnCl2) = 0.0769 * 100.5 = 7.73 g.

Answer: 7.73 g.