Chemistry 0620 · IGCSE · Exothermic and endothermic reactions

Exothermic and endothermic reactions — practice question

The equation for the complete combustion of methane 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$-359\ \text{kJ mol}^{-1}$
  • C$-323\ \text{kJ mol}^{-1}$
  • D$+102\ \text{kJ mol}^{-1}$

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