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Question

Calculate the weight of lime (CaO) obtained by heating 200kg of 95% pure lime stone (CaCO3).

CaCO3CaO+CO2

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Solution

∵ 100 kg impure sample has pure CaCO3 = 95 kg
∴ 200 kg impure sample has pure CaCO3 = (95 x 200 / 100) = 190 kg.

CaCO3CaO+CO2

∵ 100 kg CaCO3 gives CaO = 56 kg.
∴ 190 kg CaCO3 gives CaO = (56 x 190 / 100) = 106.4 kg.

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