Calculate the mass of zinc reacted with 400 grams of a 4.9% sulfuric acid solution.

Zinc metal reacts with sulfuric acid to release hydrogen gas and form zinc sulfate. The reaction is described by the following equation:

Zn + H2SO4 = ZnSO4 + H2;

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

Let’s calculate the amount of sulfuric acid.

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

N H2SO4 = 400 x 0.049 / 98 = 0.2 mol;

0.2 mol of zinc will enter into the reaction. Let’s calculate its weight.

M Zn = 65 grams / mol;

m Zn = 0.2 x 65 = 13 grams;