Calculate the mass of hydrochloric acid required to dissolve zinc a) in the amount of 2 mol b) 6.5 g.

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.

А.

For the reaction with 2 moles of zinc, 4 moles of acid are needed. Let’s calculate its weight.

M HCl = 1 + 35.5 = 36.5 grams / mol; m HCl = 4 x 36.5 = 146 grams;

B.

Let’s calculate the amount of zinc.

M Zn = 65 grams / mol; N Zn = 6.5 / 65 = 0.1 mol;

For the reaction with 0.1 mol of zinc, 0.2 mol of acid is required. Let’s calculate its weight.

M HCl = 1 + 35.5 = 36.5 grams / mol; m HCl = 0.2 x 36.5 = 7.3 grams;