Find the mass of calcium oxide, which is formed during the decomposition of 300 g of calcium carbonate.

The decomposition reaction of calcium carbonate when heated is described by the following chemical equation:

CaCO3 = CaO + CO2 ↑;

Let’s determine the chemical amount of calcium carbonate. To do this, we divide its weight by the mass of 1 mole of the substance.

M CaCO3 = 40 + 12 + 16 x 3 = 100 grams / mol;

N CaCO3 = 300/100 = 3 mol;

The same molar amounts of calcium oxide and carbon dioxide can theoretically be obtained.

Let’s calculate the mass of calcium oxide. To do this, multiply the amount of the substance by the weight of 1 mole of the substance.

M CaO = 40 + 16 = 56 grams / mol;

m CaO = 3 x 56 = 168 grams;