Calculate the mass and amount of magnesium that will completely react with hydrochloric acid weighing 7.3 grams

Mg + 2HCl = MgCl2 + H2.

M (Mg) = 24 g / mol.

M (HCl) = 35.5 + 1 = 36.5 g / mol.

Let us determine the mass of magnesium by the reaction equation.

X g of magnesium – 7.3 g of hydrochloric acid.

24 g / mol Mg – 2 * 36.5 g / mol HCl.

X = 24 * 7.3 / (2 * 36.5) = 2.5 g.

The mass of magnesium is 2.5 grams.

n = 2.5 / 24 = 0.1 mol.

The amount of magnesium substance is 0.1 mol.

Answer: 2.5 g; 0.1 mol.