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JAMB Chemistry 1982 Question 49

Question 49

Chemical Equilibrium

The production of ammonia by the Haber process may be represented by the equilibrium equation N2(g) + 3H2(g) ⇌ 2NH3 ΔH = −22kJ. Therefore the production of ammonia will be favoured by

  1. A.only high pressure
  2. B.only high temperature
  3. C.a combination of high temperature and low pressure
  4. D.a combination of low temperature and high pressure
  5. E.low pressure
Show the answer and explanation

Answer: D (a combination of low temperature and high pressure)

Explanation

The forward reaction is exothermic (favoured by low temperature) and reduces 4 moles of gas to 2 (favoured by high pressure).