# Quicklime (calcium oxide) is obtained by heating limestone. Knowing that calcium oxide is obtained

Quicklime (calcium oxide) is obtained by heating limestone. Knowing that calcium oxide is obtained from the decomposition of calcium carbonate, calculate how much quicklime can be obtained from 200 kg of limestone containing 20% impurities. theoretical yield 85%.

The decomposition reaction of limestone is described by the following chemical reaction equation:

CaCO3 = CaO + CO2;

The decomposition of 1 mol of limestone synthesizes 1 mol of gaseous carbon dioxide.

This also synthesizes 1 mol of calcium oxide

Let’s calculate the available chemical amount of calcium carbonate substance.

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

N CaCO3 = 200,000 x 0.8 / 100 = 1,600 mol;

Taking into account the yield in the course of the reaction, 1,600 x 0.85 = 1,360 mol of calcium oxide will be synthesized.

N CaO = 1,360 mol;

Its weight will be:

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

m CaO = 56 x 1 360 = 76.16 kg;

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