Chemistry 0620 · IGCSE · Exothermic and endothermic reactions

Exothermic and endothermic reactions — practice question

The equation below represents the complete combustion of methane. $\text{CH}_4\text{(g)} + 2\text{O}_2\text{(g)} \rightarrow \text{CO}_2\text{(g)} + 2\text{H}_2\text{O( g)}$ The bond energies are listed in the table. What is the energy change for this reaction?

  • A$-818\,\text{kJ mol}^{-1}$
  • B$-359\,\text{kJ mol}^{-1}$
  • C$-323\,\text{kJ mol}^{-1}$
  • D$+102\,\text{kJ mol}^{-1}$

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