20 grams of magnesium oxide reacted with hydrochloric acid. Calculate the mass of the salt formed.

The mass of magnesium oxide is 20 g.

Let us determine the mass of the formed salt.

First, we write down the reaction equation for this problem.

MgO + 2HCl = MgCl2 + H2O.

First, we calculate the molar mass of magnesium oxide and salt.

M (MgO) = 24 + 16 = 40 g / mol.

M (MgCl2) = 24 + 35.5 * 2 = 95 g / mol.

Next, use the reaction equation to determine the mass of the salt obtained.

20 g of magnesium oxide – x mol of magnesium chloride.

40 g / mol of magnesium oxide – 95 g / mol of magnesium chloride.

X = 20 * 95: 40 = 47.5 g.

The result is an answer equal to 47.5 grams.