Chemistry 0620 · IGCSE · Exothermic and endothermic reactions

Exothermic and endothermic reactions — practice question

When hydrogen reacts with oxygen, it burns exothermically. The reaction is represented by $2\text{H}_2 + \text{O}_2 \rightarrow 2\text{H}_2\text{O}$. The table lists the bond energies involved. What amount of energy is released in this reaction?

  • A$-3226\,\text{kJ mol}^{-1}$
  • B$-884\,\text{kJ mol}^{-1}$
  • C$-486\,\text{kJ mol}^{-1}$
  • D$-442\,\text{kJ mol}^{-1}$

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