Several pieces of zinc were poured into 150 g of hydrochloric acid solution, where the mass fraction of HCl is 30%

Several pieces of zinc were poured into 150 g of hydrochloric acid solution, where the mass fraction of HCl is 30%. Calculate the amount of hydrogen evolved.

Zinc interacts with hydrogen chloride to release hydrogen gas and form zinc chloride:

Zn + 2HCl = ZnCl2 + H2;

1 mole of zinc reacts with 2 moles of acid. This forms 1 mol of salt and releases 1 mol of hydrogen gas.

Let’s calculate the chemical amount of a substance in 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 = 150 x 0.3 / 36.5 = 1.23 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 = 1.23 / 2 = 0.615 mol; V H2 = 0.615 x 22.4 = 13.776 liters;