What volume of hydrogen will be obtained by the reaction of hydrochloric acid

What volume of hydrogen will be obtained by the reaction of hydrochloric acid with magnesium, the mass of which is 50 g, containing 2% of impurities.

Magnesium dissolves in hydrochloric acid solution. The reaction is described by the following chemical equation:

Mg + 2HCl = MgCl2 + H2 ↑;

Let’s find the molar amount of a substance of metallic magnesium.

To do this, we divide this weight by the weight of 1 mole of metallic magnesium.

M Mg = 24 grams / mol;

N Mg = 50 x (1 – 0.02) / 24 = 2.042 mol;

The same amount of hydrogen gas will be produced.

Let’s calculate the volume of hydrogen.

For this purpose, we multiply the amount of substance by the volume of 1 mole of gas (filling volume 22.4 liters).

V H2 = 2.042 x 22.4 = 45.741 liters;