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

To solve the problem, we write down the equation and data:
M = 5.6 g. Xg -?
CaO + H2O = Ca (OH) 2 – hydration reaction, calcium hydroxide obtained;
1 mol 1 mol;
Let’s make calculations:
M (CaO) = 56 g / mol;
MCa (OH) 2 = 74 g / mol.
Determine the amount of moles of calcium oxide, if the mass is known:
Y (CaO) = m / M = 5.6 / 56 = 0.1 mol;
Y Ca (OH) 2 = 0.1 mol since the amount of these substances is equal according to the equation and is 1 mol.
We find the mass of the reaction product by the formula:
m Ca (OH) 2 = Y / M = 0.1 * 74 = 7.4 g.
Answer: The mass of calcium hydroxide is 7.4 g.