Calcining calcium carbonate yielded calcium oxide weighing 112 g. Determine the mass of decomposed

Calcining calcium carbonate yielded calcium oxide weighing 112 g. Determine the mass of decomposed calcium carbonate if the mass fraction of the product yield is 80%.

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

CaCO3 = CaO + CO2 ↑;

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

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

N CaO = 112/45 = 2 mol;

The same amount of calcium carbonate will be decomposed.

Let’s calculate its weight taking into account the product yield of 80%.

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

m CaCO3 = 2 x 100 / 0.8 = 250 grams;