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in Chemistry by (49.6k points)

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

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100 kg of CaCO3 gives 56 kg of CaO. 

Since lime stone is 95% pure; amount of CaCO3 present in 200 kg of impure sample = 190 kg CaCO3 100 kg of CaCO3 gives 56 kg of CaO 

1 kg of CaCO3 gives 56/100 kg of CaO 

190 kg of CaCO3 give 56/100× 190 = 106.4 kg of CaO.

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