How much zinc will react with hydrochloric acid, taken in excess, to produce 11.2 liters of hydrogen?

The reaction is described by the following chemical equation:

Zn + 2HCl = ZnCl2 + H2;

Let’s calculate the chemical amount of hydrogen. For this purpose, we divide the volume of gas by the volume of 1 mole of gas (which is 22.4 liters).

N H2 = 11.2 / 22.4 = 0.5 mol;

To obtain this amount of hydrogen, it is necessary to dissolve 0.5 mol of zinc.

Let’s find the weight of zinc. To do this, multiply the amount of substance by the weight of 1 mole of metal.

m Zn = 0.5 x 65 = 32.5 grams;