Chemistry 0620 · IGCSE · Exothermic and endothermic reactions

Exothermic and endothermic reactions — practice question

The equation representing the combustion of methane is given below. $\text{CH}_4 + 2\text{O}_2 \rightarrow \text{CO}_2 + 2\text{H}_2\text{O}$ The energy change for the combustion of methane is $-890\,\text{kJ mol}^{-1}$. The bond energies are listed in the table. What is the bond energy of the C=O bond?

  • A$+49\,\text{kJ mol}^{-1}$
  • B$+841\,\text{kJ mol}^{-1}$
  • C$+1301\,\text{kJ mol}^{-1}$
  • D$+1335\,\text{kJ mol}^{-1}$

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