Chemistry 0620 · IGCSE · Exothermic and endothermic reactions

Exothermic and endothermic reactions — practice question

Ethene undergoes combustion in oxygen, producing carbon dioxide and water vapour. $\text{C}_2\text{H}_4 + 3\text{O}_2 \rightarrow 2\text{CO}_2 + 2\text{H}_2\text{O}$ The table shows the bond energies. What is the energy change for this reaction?

  • A$-2959\ \text{kJ mol}^{-1}$
  • B$-2313\ \text{kJ mol}^{-1}$
  • C$-1319\ \text{kJ mol}^{-1}$
  • D$-399\ \text{kJ mol}^{-1}$

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