Calculate how much hydrogen can be obtained by reacting 6 g of magnesium with an excess of hydrochloric acid?

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

Mg + 2HCl = MgCl2 + H2 ↑;

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

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

M Mg = 24 grams / mol;

N Mg = 6/24 = 0.25 mol;

The same amount of hydrogen gas will be produced.

Let’s determine the volume of hydrogen.

To this end, we multiply the amount of substance by the volume of 1 mole of gas (which is 22.4 liters).

V H2 = 0.25 x 22.4 = 5.6 liters;