As a result of the dissolution of zinc in sulfuric acid, 3.01 × 10 to the 21st power

As a result of the dissolution of zinc in sulfuric acid, 3.01 × 10 to the 21st power of hydrogen molecules were released, what is the mass of zinc?

Zn + H2SO4 = ZnSO4 + H2.

Let’s find the amount of hydrogen substance released as a result of zinc dissolution:

n = N / Na, where Na is Avogadro’s constant. We get that n = 3.01 * 1021 / (6.02 * 1023) = 0.005 mol.

It follows from the reaction that 1 mole of hydrogen is formed from 1 mole of zinc. Therefore 0.005 mol of hydrogen is formed from 0.005 mol of zinc. Now we can find the mass of Zn:

m = n * Mr = 0.005 * 65 = 0.32 g.