Question

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

(A) 104.4 kg 

(B) 105.4 kg 

(C) 212.8 kg 

(D) 106.4 kg

Answer 1

Correct option: (D) 106.4 kg

Explanation:

∵ 100 kg impure sample has pure

CaCO₃ = 95 kg

∴ 200 kg impure sample has pure CaCO₃

= (95 x 200 / 100) = 190 kg. CaCO₃ →  CaO + CO₂

∵ 100 kg CaCO₃ gives CaO = 56 kg.

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