N2(g)+3H2(g)→2NH3(g);ΔH=−22kcal
Activation energy, Ea for the given reaction is 70kcal. Find the activation energy for 2NH3(g)→N2(g)+3H2(g) in kcal.
A
42
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B
64
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C
92
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D
85
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Solution
The correct option is C 92 The given reaction is an exothermic reaction since ΔH=−ve EaF =Activation energy of the forward reaction EaB= Activation energy of the backward reaction
Enthalpy change can be expressed also in terms of activation energy,