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Chemistry · May / June 2026 · Paper 11 · Question 14

5070Exothermic and endothermic reactions

Some bond energies are given in the table. | bond | bond energy in kJ/mol | |------|----------------------| | C–C | 347 | | C=C | 612 | | C–H | 413 | | O=O | 498 | | C=O | 805 | | O–H | 464 | Ethene burns in oxygen to form carbon dioxide and water. C2H4 + 3O2 → 2CO2 + 2H2O What is the enthalpy change of this reaction?

  1. A–1583 kJ/mol
  2. B–1318 kJ/mol
  3. C–655 kJ/mol
  4. D–390 kJ/mol

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Correct answer: B. –1318 kJ/mol

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