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Chemistry · Oct / Nov 2023 · Paper 11 · Question 15

5070Exothermic and endothermic reactions

Hydrogen and bromine react to form hydrogen bromide. H2 + Br2 → 2HBr Bond energy data is given in the table. | bond | bond energy in kJ / mol | | H–H | 436 | | Br–Br | 193 | | H–Br | 366 | What is the enthalpy change, ΔH, for this reaction?

  1. A–263 kJ / mol
  2. B–103 kJ / mol
  3. C+103 kJ / mol
  4. D+263 kJ / mol

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Correct answer: B. –103 kJ / mol

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