Determine the mass of zinc chloride obtained by reacting zinc with 36.5 g of hydrochloric acid solution with a mass fraction of 20%.

1. We write down the equation of the reaction of obtaining zinc chloride:

Zn + 2 HCl = ZnCl2 + H2 ↑;

2.Calculate the mass of hydrogen chloride:

m (HCl) = w (HCl) * m (hydrochloric acid);

m (HCl) = 0.2 * 36.5 = 7.3 g;

3. find the chemical amounts of hydrogen chloride and zinc chloride:

n (HCl) = m (HCl): M (HCl) = 7.3: 36.5 = 0.2 mol;

n (ZnCl2) = n (HCl): 2 = 0.2: 2 = 0.1 mol;

4.determine the mass of the obtained chloride:

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

M (ZnCl2) = 65 + 35.5 * 2 = 136 g / mol;

m (ZnCl2) = 0.1 * 136 = 13.6 g.

Answer: 13.6 g.