1.

20 grams of CaCO3 is heated, how much calcium oxide will produce?(a) 5.6 grams(b) 11.2 grams(c) 22.4 grams(d) 44.8 grams

Answer» Right choice is (b) 11.2 grams

Explanation: The balance chemical reaction is CaCO3 -> CaO + CO2, moles of CaO = moles of CaCO3 = 20/100 = 0.2, => amount of CaO = 0.2*56 = 11.6 grams.


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