Calculate the mass of hydrogen formed by the action of 0.2 mol of zinc in a solution containing 35 g of sulfuric acid.

Zinc dissolves in sulfuric acid, the reaction proceeds according to the following chemical equation:

Zn + H2SO4 = ZnSO4 + H2;

Let’s calculate the chemical amount of sulfuric acid.

To do this, divide its weight by the weight of 1 mole of the substance.

M H2SO4 = 2 + 32 + 16 x 4 = 98 grams / mol;

N H2SO4 = 35/98 = 0.357 mol;

The acid is taken in excess. 0.2 mol of zinc will react with 0.2 mol of acid.

The reaction will release the same amount of hydrogen.

Let’s calculate its mass.

For this purpose, we multiply the amount of the substance by the weight of 1 mole of hydrogen gas.

M H2 = 2 grams / mol;

m H2 = 2 x 0.2 = 0.4 grams;