Question

How much carbon dioxide is lost in the overall reaction if 30Kg of limestone is strongly heated to give calcium oxide? (Atomic mass: Ca =40, O =16, C=12)
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Answer 1

Calcium carbonate decomposes on heating to form

Calcium carbonate decomposes, on heating , to form calcium oxide and carbon dioxide. Calcium carbonate decomposes, on heating , to form calcium oxide and carbon dioxide

Chemical reaction involved is:

CaCO3  → CaO + CO2

Molar mass of CaCO3  = 40 + 12 + 16 × 3 = 100g

According to the balanced reaction 100 g of CaCO3  produces 1 mol of CO2  i.e. 22.4 L at STP.

∴50 g CaCO3  will produce  22.4/100 × 50 = 11.2 L  CO2  at STP.

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