Determine how much hydrogen was released if 100 g of hydrochloric acid entered into a reaction with zinc.

Zinc reacts with hydrochloric acid to release hydrogen gas and form zinc chloride:

Zn + 2HCl = ZnCl2 + H2;

1 mole of metal reacts with 2 moles of acid. This synthesizes 1 mol of salt and 1 mol of hydrogen.

Let’s calculate the chemical amount of a substance in 100 grams of hydrochloric acid. To do this, divide the weight of the substance by the weight of 1 mole of the substance.

M HCl = 1 + 35.5 = 36.5 grams / mol; N HCl = 100 / 36.5 = 2.74 mol;

When reacting with such an amount of acid, 2 times less hydrogen will be synthesized.

Let’s calculate the volume of hydrogen. To do this, multiply the amount of substance by the volume of 1 mole of gas, which is 22.4 liters.

N H2 = 2.74 / 2 = 1.37 mol; V H2 = 1.37 x 22.4 = 30.69 liters;