Chemistry 0620 · IGCSE · Exothermic and endothermic reactions

Exothermic and endothermic reactions — practice question

Ammonia is produced when nitrogen reacts with hydrogen in the presence of an iron catalyst. This reaction is exothermic. The reaction equation is given below. $\text{N}_2 + 3\text{H}_2 \rightarrow 2\text{NH}_3$. The bond energies are listed in the table. What is the energy released in this reaction?

  • A$-4593\,\text{kJ mol}^{-1}$
  • B$-1083\,\text{kJ mol}^{-1}$
  • C$-959\,\text{kJ mol}^{-1}$
  • D$-87\,\text{kJ mol}^{-1}$

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