Chemistry 9701 · AS & A Level · Equilibria

Equilibria — practice question

For a certain reversible reaction, the product yield rises • when the temperature is raised; • when the pressure is lowered. Which equation might represent this reversible reaction?

  • A$\text{CH}_4(g) + \text{H}_2\text{O}(g) \rightleftharpoons 3\text{H}_2(g) + \text{CO}(g)$ $\Delta H = +206\,\text{kJ mol}^{-1}$
  • B$4\text{NH}_3(g) + 3\text{O}_2(g) \rightleftharpoons 2\text{N}_2(g) + 6\text{H}_2\text{O}(g)$ $\Delta H = -227\,\text{kJ mol}^{-1}$
  • C$2\text{NO}_2(g) \rightleftharpoons \text{N}_2\text{O}_4(g)$ $\Delta H = -58\,\text{kJ mol}^{-1}$
  • D$3\text{O}_2(g) \rightleftharpoons 2\text{O}_3(g)$ $\Delta H = +143\,\text{kJ mol}^{-1}$

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