ChemistryEnergy changesJAMB
For 2H₂(g) + O₂(g) → 2H₂O(l), ΔH = −572 kJ. How much heat is released when 1 g of hydrogen burns? (H = 1)
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Answer: A. 143 kJ
4 g of H₂ releases 572 kJ, so 1 g releases 572 ÷ 4 = 143 kJ.
An AdmitMe practice question, written for the JAMB syllabus. Not an official past question.