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JAMB Chemistry 2023 Question 11

Question 11

Rates of Reaction

The above diagram illustrates the energy profile of the catalyst and uncatalysed reaction of A(g) + B(g) → AB(g). Calculate the activation energies in KJ of the catalysed and uncatalysed unreverse reactions.

Diagram for this question
  1. A.500, 300
  2. B.300, 500
  3. C.−500, −300
  4. D.−300, −500
Show the answer and explanation

Answer: B (300, 500)

Explanation

Activation energy = peak energy − reactant energy. Catalysed: 400 − 100 = 300 kJ; uncatalysed: 600 − 100 = 500 kJ.