Chemistry 5070 · O Level · Exothermic and endothermic reactions

Exothermic and endothermic reactions — practice question

Hydrogen combines with oxygen to form water. $\text{H} - \text{H} + \text{O} = \text{O} \rightarrow \text{H} - \text{O} - \text{H}$ A table shows some bond energies. Use the data in the table to determine the enthalpy change of reaction.

  • A$-920\ \text{kJ mol}^{-1}$
  • B$-834\ \text{kJ mol}^{-1}$
  • C$-484\ \text{kJ mol}^{-1}$
  • D$+442\ \text{kJ mol}^{-1}$

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