# How much aluminum is required for the reaction with hydrochloric acid, taken in excess, to obtain 5.6 liters of hydrogen.

September 23, 2021 | education

| Aluminum reacts violently with hydrochloric acid. In this case, an aluminum chloride salt is formed and elemental hydrogen is released. The interaction is described by the following chemical equation.

Al + 3HCl = AlCl3 + 3/2 H2;

Let’s calculate the chemical amount of the evolved hydrogen gas.

To do this, we find the ratio of its volume to the volume of 1 mole of gas (filling a space with a volume of 22.4 liters).

N H2 = 5.6 / 22.4 = 0.25 mol;

To obtain such an amount of hydrogen, it is required to dissolve 0.25 x 2/3 = 0.1666 mol of aluminum.

Let’s calculate its weight.

M Al = 27 grams / mol;

m Al = 27 x 0.1666 = 4.5 grams;

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