Chemistry 9701 · AS & A Level · Chemical energetics

Chemical energetics — practice question

Use the data below for this question. $\Delta H_f^\circ(\text{CO(g)}) = -111\,\text{kJ mol}^{-1}$ $\Delta H_f^\circ(\text{CO}_2\text{(g)}) = -394\,\text{kJ mol}^{-1}$ $\Delta H_f^\circ(\text{Fe}_2\text{O}_3\text{(s)}) = -822\,\text{kJ mol}^{-1}$ Iron(III) oxide reacts with carbon monoxide. $3\text{CO(g)} + \text{Fe}_2\text{O}_3\text{(s)} \rightarrow 3\text{CO}_2\text{(g)} + 2\text{Fe(s)}$ Calculate the enthalpy change when $55.8\,\text{g}$ of iron are produced by this reaction?

  • A$-27.0\,\text{kJ}$
  • B$-13.5\,\text{kJ}$
  • C$+13.5\,\text{kJ}$
  • D$+27.0\,\text{kJ}$

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