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Question

An exothermic reaction A B has an activation energy of 17 kJ per mole of A. The heat of reaction is 40 KJ. The activation energy for the reverse reaction B A is
  1. 57 kJ
  2. 17 kJ
  3. 23 kJ
  4. 97 kJ


Solution

The correct option is A 57 kJ
For exothermic reaction
Ea(backward) = Ea(forward) + Heat of Reaction
                                                        (Magnitude only)
= 17 + 40 = 57 kJ

 

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