Calculate the mass of the salt that is formed by the interaction of 19.5 g of zinc with an excess of hydrochloric acid.

Zinc metal reacts with hydrochloric (hydrochloric) acid to release hydrogen gas and form zinc chloride. The reaction is described by the following equation:

Zn + 2HCl = ZnCl2 + H2;

1 mole of metal reacts with 2 moles of acid. This synthesizes 1 mol of salt and 1 mol of hydrogen.

Let’s calculate the amount of zinc.

M Zn = 65 grams / mol;

N Zn = 19.5 / 65 = 0.3 mol;

The same amount of zinc chloride will be synthesized. Let’s calculate its weight.

M ZnCl2 = 65 + 35.5 x 2 = 136 grams / mol;

m ZnCl2 = 0.3 x 136 = 40.8 grams;