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JAMB Chemistry 1982 Question 16

Question 16

Chemical Equilibrium

In the manufacture of ammonia by the reaction N2(g) + 3H2(g) ⇌ 2NH3(g) ΔH = −92.37 kJ, the amount of ammonia formed at equilibrium will increase if

  1. A.the pressure decreases
  2. B.the temperature increases
  3. C.the temperature decreases
  4. D.a catalyst is used
  5. E.the physical states of the reactants are changed.
Show the answer and explanation

Answer: C (the temperature decreases)

Explanation

The forward reaction is exothermic, so lowering the temperature shifts the equilibrium to the right (Le Chatelier). A catalyst only speeds up reaching equilibrium.