Chemistry · May / June 2024 · Paper 11 · Question 15

Hydrogen reacts with oxygen to produce water. \[\ce{H-H + O=O -> H-O-H}\ \text{(displayed as H–H + O=O → H–O–H with H–O–H above and below)}\] Some bond energies are shown. | bond | bond energy in kJ/mol | | H–H | 436 | | O–O | 146 | | O=O | 496 | | O–H | 463 | Using the data in the table, what is the enthalpy change of reaction?

1. A–920 kJ / mol
2. B–834 kJ / mol
3. C–484 kJ / mol
4. D+442 kJ / mol

As printed in the paper