Zinc with a mass of 7 g was dissolved in an excess of hydrochloric acid, determine the volume of released hydrogen.

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 zinc reacts with 2 moles of acid. This forms 1 mole of salt and releases 1 mole of hydrogen gas.

Let’s calculate the available chemical amount of zinc. To do this, we divide the weight of pure metal by the weight of 1 mole of metallic zinc.

M Zn = 65 grams / mol; N Zn = 7/65 = 0.108 mol;

The same amount of hydrogen and zinc chloride salt will be synthesized.

Let’s calculate the volume of hydrogen. To do this, multiply the amount of substance by the volume of 1 mole of gas, which is 22.4 liters.

N H2 = 0.108 mol; V H2 = 0.108 x 22.4 = 2.42 liters;