Chemistry 5070 · O Level · Exothermic and endothermic reactions

Exothermic and endothermic reactions — practice question

State the balanced equation and enthalpy change, $\Delta H$, for the complete combustion of butanol, $\text{C}_4\text{H}_9\text{OH}$.

  • A$\text{C}_4\text{H}_9\text{OH}(l) + 5\text{O}_2(g) \rightarrow 4\text{CO}_2(g) + 5\text{H}_2\text{O}(g)$, $\Delta H = -2676\,\text{kJ mol}^{-1}$
  • B$\text{C}_4\text{H}_9\text{OH}(l) + 5\text{O}_2(g) \rightarrow 4\text{CO}_2(g) + 5\text{H}_2\text{O}(g)$, $\Delta H = +2676\,\text{kJ mol}^{-1}$
  • C$\text{C}_4\text{H}_9\text{OH}(l) + 6\text{O}_2(g) \rightarrow 4\text{CO}_2(g) + 5\text{H}_2\text{O}(g)$, $\Delta H = -2676\,\text{kJ mol}^{-1}$
  • D$\text{C}_4\text{H}_9\text{OH}(l) + 6\text{O}_2(g) \rightarrow 4\text{CO}_2(g) + 5\text{H}_2\text{O}(g)$, $\Delta H = +2676\,\text{kJ mol}^{-1}$

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