Chemistry 0620 · IGCSE · Exothermic and endothermic reactions

Exothermic and endothermic reactions — practice question

Ethene gas, $\text{C}_2\text{H}_4$, is fully combusted in excess oxygen so that carbon dioxide and water are produced. The equation for this exothermic reaction is shown below. $\text{C}_2\text{H}_4 + 3\text{O}_2 \rightarrow 2\text{CO}_2 + 2\text{H}_2\text{O}$ The table gives the bond energies for the bonds involved in the reaction. What is the total energy change in this reaction?

  • A$-954\ \text{kJ mol}^{-1}$
  • B$-1010\ \text{kJ mol}^{-1}$
  • C$-1313\ \text{kJ mol}^{-1}$
  • D$-1369\ \text{kJ mol}^{-1}$

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