ChemistryEnergy changesWAEC
For C + O₂ → CO₂, ΔH = −394 kJ/mol. How much heat is released when 6 g of carbon burns completely? [C = 12]
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Answer: A. 197 kJ
6 g is 0.5 mol, so heat released = 0.5 × 394 = 197 kJ.
An AdmitMe practice question, written for the WAEC syllabus. Not an official past question.