Chemistry 0620 · IGCSE · Exothermic and endothermic reactions

Exothermic and endothermic reactions — practice question

Hydrogen reacts with oxygen. The reaction equation is given as $2\text{H}_2 + \text{O}_2 \rightarrow 2\text{H}_2\text{O}$. The table lists the bond energies that are involved. What is the energy released in the 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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