Quicklime CaO is obtained by calcining CaCO3 limestone in special kilns. What mass of quicklime

Quicklime CaO is obtained by calcining CaCO3 limestone in special kilns. What mass of quicklime can be obtained by firing 200 kg of limestone containing 20% of impurities? The mass fraction of the output of quicklime is 90%.

The limestone decomposition reaction 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 during the reaction, 1600 x 0.9 = 1440 mol of calcium oxide will be synthesized.
N CaO = 1,440 mol;
Its weight will be:
M CaO = 40 + 16 = 56 grams / mol;
m CaO = 56 x 1 440 = 80.64 kg;