Calculate the weight of CaO that can be obtained by heating 200kg of limestone which is 95% pure. (At. Mass of Ca = 40, C=12 and O=16).

Explanation

`CaCO_(3) overset(Delta) to CaO + CO_(2)`
100 kg of `CaCO_(3)`, gives 56 kg of CaO.
Since, lime stone is 95% pure, amount of `CaCO_(3)`, present in 200 kg of impure sample = 190 kg `CaCO_()`, 100 kg of `CaCO_(3)`, gives 56 kg of caO
1 kg of `CaCO_(3)` , gives `56/100` kg of CaO
190 kg of `CaCO_(3)` gives `56/100 xx 190 = 106.4` kg of CaO.