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Atomic Mass

quick lime, C...

Question

quick lime, CaO, is obtained by burning of limestone, CaCO3, in a lime kiln and the reaction is represented as;
CaCO3------- CaO + CO2 . what weight of limestone must be heated to obtain 112 kgs of quick lime?

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Solution

The given reaction ;
CaCO₃ → CaO + CO₂
Molar mass of CaCO₃ = 100 g mol^-1
Molar mass of CaO = 56 g mol^-1
Molar mass of CO₂ = 44 g mol^-1
According to above reaction , 56 g of CaO is obtained by heating = 100 g of CaCO₃
112 g of CaO is obtained = $\frac{100 ×112}{56}$ = 200 g of CaCO₃

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