Chemistry 0620 · IGCSE · Exothermic and endothermic reactions

Exothermic and endothermic reactions — practice question

Methane reacts while oxygen is in excess. The equation is given below. $\text{CH}_4(g) + 2\text{O}_2(g) \rightarrow \text{CO}_2(g) + 2\text{H}_2\text{O}(g)$ The bond energies are listed in the table. What is the energy change for the reaction?

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

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