Chemistry 0620 · IGCSE · Exothermic and endothermic reactions

Exothermic and endothermic reactions — practice question

A table shows some bond energies. Hydrogen reacts with oxygen, and this reaction releases energy. $\text{2H}_2(g) + \text{O}_2(g) \rightarrow \text{2H}_2\text{O}(g)$ What is the energy change for the reaction?

  • A$-3208\,\text{kJ mol}^{-1}$
  • B$-908\,\text{kJ mol}^{-1}$
  • C$-472\,\text{kJ mol}^{-1}$
  • D$-448\,\text{kJ mol}^{-1}$

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