When 50 kg of pure calcium carbonate was calcined, its mass decreased by 4.4 kg.

When 50 kg of pure calcium carbonate was calcined, its mass decreased by 4.4 kg. How much percent of calcium carbonate decomposed?

The thermal decomposition reaction of calcium carbonate upon heating is described by the following chemical reaction equation:

CaCO3 = CaO + CO2 ↑;

Find the chemical amount of carbon dioxide.

M CO2 = 12 + 16 x 2 = 44 grams / mol;

N CO2 = 4 400/44 = 100 mol;

The same amount of calcium carbonate will be decomposed.

Let’s calculate its weight.

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

m CaCO3 = 100 x 100 = 10,000 grams = 10 kg;

The fraction of decomposition of calcium carbonate will be:

K = 10/50 = 0.2 = 20%;