Chemistry 9701 · AS & A Level · Chemical energetics

Chemical energetics — practice question

Methanol can be produced by allowing carbon monoxide to react with hydrogen. $\text{CO(g)} + 2\text{H}_2\text{(g)} \rightarrow \text{CH}_3\text{OH(g)}$ The average bond energies needed are listed below. $E(\text{C} \equiv \text{O}) = 1077\,\text{kJ mol}^{-1}$ $E(\text{C-O}) = 360\,\text{kJ mol}^{-1}$ $E(\text{C-H}) = 410\,\text{kJ mol}^{-1}$ $E(\text{H-H}) = 436\,\text{kJ mol}^{-1}$ $E(\text{O-H}) = 460\,\text{kJ mol}^{-1}$ Calculate the enthalpy change for this reaction.

  • A$-537\,\text{kJ mol}^{-1}$
  • B$-101\,\text{kJ mol}^{-1}$
  • C$+101\,\text{kJ mol}^{-1}$
  • D$+537\,\text{kJ mol}^{-1}$

Worked solution & mark scheme

This 1-mark question has a full step-by-step worked solution and mark scheme.

  • Full mark scheme, point by point
  • Step-by-step worked solution
  • Write your answer & get it marked instantly by AI