How much hydrogen will be released if zinc weighing 6.5 g is put into a solution of sulfuric acid taken in excess?

When zinc reacts with an excess of hydrochloric acid, the middle salt of zinc chloride ZnCl2 is formed and molecular hydrogen is released. The reaction equation looks like this:

Zn + 2 HCl = ZnCl2 + H2

Let’s calculate the volume of the evolved gas according to the reaction equation. The molar mass of zinc is 65 g / mol; molar volume of hydrogen at normal conditions is equal to 22.4 l / mol (according to Avogadro’s law).

6.5 g of zinc corresponds to X g l. hydrogen

65 g / mol zinc corresponds to 22.4 l / mol hydrogen

X = 6.5 * 22.4 / 65 = 2.24 liters.

Answer: 2.24 liters of hydrogen.