Calculate the mass of calcium hydroxide obtained by interaction with water of calcium oxide weighing 11.2 g.

Reaction equation: CaO + H2O = Ca (OH) 2
According to the periodic table, we determine the molar mass of calcium oxide: M = 40 + 16 = 56 g / mol. And calcium hydroxide: M = 40 + 16 * 2 + 1 * 2 = 74 g / mol.
Let’s find the amount of calcium oxide: n = m / M = 11.2 g / 56 g / mol = 0.2 mol.
According to the reaction equation, from 1 mol of oxide, 1 mol of hydroxide is obtained, which means n (CaO) = n (Ca (OH) 2) = 0.2 mol.
We calculate the mass of hydroxide: m = n * M = 0.2 mol * 74 g / mol = 14.8 g.
Answer: the mass of calcium hydroxide is 14.8 g.