28 g of calcium oxide reacted with water. Calculate m calcium hydroxide.

1. The interaction of calcium oxide with water proceeds according to the equation:

CaO + H2O = Ca (OH) 2;

2.find the chemical amount of calcium oxide:

n (CaO) = m (CaO): M (CaO);

M (CaO) = 40 + 16 = 56 g / mol;

n (CaO) = 28: 56 = 0.5 mol;

3.determine the amount of calcium hydroxide obtained:

n (Ca (OH) 2) = n (CaO) = 0.5 mol;

4.Calculate the mass of calcium hydroxide:

m (Ca (OH) 2) = n (Ca (OH) 2) * M (Ca (OH) 2);

M (Ca (OH) 2) = 40 + 2 * 17 = 74 g / mol;

m (Ca (OH) 2) = 0.5 * 74 = 37 g.

Answer: 37 g.