56 g of calcium oxide reacted with water. Calculate the mass of the salt formed.

We compose the reaction equation:
H2O + CaO = Ca (OH) 2.
1) According to the periodic table, we calculate the molar mass of calcium oxide: 40 + 16 = 56.
2) Find the amount of calcium oxide substance. To do this, divide the mass of the oxide by its molar mass: 56/56 = 1 mol.
3) According to the reaction equation, there is one mole of calcium hydroxide for one mole of calcium oxide. This means that the amount of calcium hydroxide substance is 1 mol.
4) Molar mass of calcium hydroxide: 40 + 1 * 2 + 16 * 2 = 74.
5) Find the mass of salt: 74 * 1 = 74g – the answer.