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JAMB Chemistry 2005 Question 39

Question 39

Chemical Equilibrium

N2(g) + 3H2(g) ⇌ 2NH3(g) ΔH = −90 kJ
In the equation above, the yield of ammonia can be decreased by

  1. A.increasing the pressure
  2. B.removing ammonia as it is formed
  3. C.increasing the temperature
  4. D.adding a catalyst
Show the answer and explanation

Answer: C (increasing the temperature)

Explanation

The forward reaction is exothermic, so raising the temperature shifts the equilibrium to the left and less ammonia is formed.