How many grams of calcium hydroxide can be obtained from calcium oxide with a mass of 5.6 g?

Given:
m (CaO) = 5.6g
To find:
m (Ca (OH) 2) =?
Decision:
1) Let’s compose the equation of the chemical reaction, let calcium hydroxide be x g
CaO + H2O = Ca (OH) 2
2) Find the molecular weight of calcium oxide and hydroxide.
M (CaO) = 40 + 16 = 56 g / mol
M (Ca (OH) 2) = 40 + (2 x 16) + (2 x 1) = 74 g / mol
3) 5.6 g: 56 g / mol = x g: 74 g / mol
x = (5.6 x 74): 56 = 7.4 g
Answer: m (Ca (OH) 2) = 7.4 g.