What is the mass of the salt formed by the interaction of 162.5 g of zinc containing 20% impurities with hydrochloric acid?

The reaction of zinc with hydrochloric acid is described by the following chemical reaction equation:

Zn + 2HCl = ZnCl2 + H2;

From one mole of zinc, one mole of zinc chloride is formed.

Let’s find the amount of pure substance in 162.5 grams of zinc containing 20% ​​impurities.

m Zn = 162.5 x 0.8 = 130 grams.

Find the amount of zinc. To do this, we divide the mass of the substance by its molar mass.

M Zn = 65 grams / mol;

N Zn = 130/65 = 2 mol;

Find the mass of 2 mol of zinc chloride. To do this, we multiply the molar mass of the salt by the amount of the substance.

M ZnCl2 = 65 + 35.5 x 2 = 136 grams / mol;

The salt mass will be:

m ZnCl2 = 136 x 2 = 272 grams;