A-LevelChemistryChemical energetics9701/12 · Oct/Nov 2014 · Q321 Mark
Use of the Data Booklet is relevant to this question. The bond energy of the Br–O bond is 235 kJ mol⁻¹. Which reactions are exothermic? 1 OH• + HBr → H₂ + BrO• 2 OH• + HBr → H₂O + Br• 3 H• + HBr → H₂ + Br•
A1, 2 and 3 are correct
B1 and 2 only are correct
C2 and 3 only are correct
D1 only is correct
✓ Correct answer
C: 2 and 3 only are correct
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