Chemistry 9701 · AS & A Level · Chemical energetics

Chemical energetics — practice question

Which equation corresponds to the standard enthalpy change of formation, $\Delta H_f^\circ$, of ethanol?

  • A$2\text{C}(s) + 2\frac{1}{2}\text{H}_2(g) + \frac{1}{2}\text{O}_2(g) \rightarrow \text{C}_2\text{H}_5\text{OH}(g)$
  • B$2\text{C}(s) + 2\frac{1}{2}\text{H}_2(g) + \frac{1}{2}\text{O}_2(g) \rightarrow \text{C}_2\text{H}_5\text{OH}(l)$
  • C$2\text{C}(s) + 3\text{H}_2(g) + \frac{1}{2}\text{O}_2(g) \rightarrow \text{C}_2\text{H}_5\text{OH}(g)$
  • D$2\text{C}(s) + 3\text{H}_2(g) + \frac{1}{2}\text{O}_2(g) \rightarrow \text{C}_2\text{H}_5\text{OH}(l)$

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