# How many liters of hydrogen will be released when 12 g of magnesium are exposed to a solution 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 magnesium substance.

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

M Mg = 24 grams / mol;

N Mg = 12/24 = 0.5 mol;

An equivalent amount of hydrogen gas will be obtained.

Let’s determine 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 = 0.5 x 22.4 = 11.2 liters;

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