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JAMB Chemistry 1989 Question 28

Question 28

Chemical Equilibrium

CO(g) + H2O(g) ⇌ CO2(g) + H2(g), ΔH = −41000 J. Which of the following factors favour the formation of hydrogen in the above reaction?
I. high pressure II. low pressure III. High temperature IV. Use of excess steam

  1. A.I, III and IV
  2. B.III only
  3. C.II, III and I
  4. D.IV only
Show the answer and explanation

Answer: D (IV only)

Explanation

There are 2 moles of gas on each side, so pressure has no effect. The forward reaction is exothermic, so high temperature works against it. Excess steam pushes the equilibrium to the right.