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Question

The mass of lime (CaO) (in kg as the nearest integer) obtained by heating 200 kg of 95% pure limestone (CaCO3) is:

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Solution

Given, mass of pure lime stone in 200 kg sample = (95×200)100 = 190 kg.

Now, CaCO3CaO+CO2

100 56 44 (Molecular mass)

100 kg CaCO356 kg CaO

190 kg CaCO356×190100=106.4 kg CaO.

So, nearest integer value is 106.

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