Chemistry · May / June 2023 · Paper 12 · Question 14

Hydrogen can be produced by reacting methane with steam. CH4 + 2H2O → CO2 + 4H2 Using the bond energies in the table, what is the enthalpy change of reaction, ΔH? | bond | bond energy in kJ/mol | | C–H | 435 | | O–H | 463 | | H–H | 436 | | C=O | 805 |

1. A–620 kJ / mol
2. B–238 kJ / mol
3. C+238 kJ / mol
4. D+620 kJ / mol

As printed in the paper