How much calcium hydroxide can be obtained if 11.2 g of calcium oxide has reacted with water?

Let’s write the reaction equation:

CaO + H2O = Ca (OH) 2

Find the amount of calcium oxide substance:

v (CaO) = m (CaO) / M (CaO) = 11.2 / 56 = 0.2 (mol).

According to the reaction equation, from 1 mol of CaO 1 mol of Ca (OH) 2 is formed, therefore:

v (Ca (OH) 2) = v (CaO) = 0.2 (mol).

Thus, the amount of calcium hydroxide substance that can be obtained:

v (Ca (OH) 2) = 0.2 (mol),

and its mass:

m (Ca (OH) 2) = v (Ca (OH) 2) * M (Ca (OH) 2) = 0.2 * 74 = 14.8 (g).