Chemistry 0620 · IGCSE · Exothermic and endothermic reactions

Exothermic and endothermic reactions — practice question

Ethene is able to undergo complete combustion, as illustrated below. $\text{C}_2\text{H}_4 + 3\text{O}=\text{O} \rightarrow 2\text{O}=\text{C}=\text{O} + 2\text{H}-\text{O}-\text{H}$ The table provides some bond energies. For the reaction, the energy change is $-1408\,\text{kJ mol}^{-1}$. Determine the bond energy of the $\text{C}=\text{O}$ in $\text{CO}_2$.

  • A$454\,\text{kJ mol}^{-1}$
  • B$673\,\text{kJ mol}^{-1}$
  • C$826\,\text{kJ mol}^{-1}$
  • D$1619\,\text{kJ mol}^{-1}$

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