ChemistryChemical combinationWAEC
What mass of calcium oxide is formed by heating 50 g of calcium trioxocarbonate(IV) to constant mass? [Ca = 40, C = 12, O = 16]
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Answer: D. 28 g
CaCO₃ (100 g) → CaO (56 g); 50 g gives 28 g. 22 g is the carbon(IV) oxide lost.
An AdmitMe practice question, written for the WAEC syllabus. Not an official past question.