The forward and backward activation energy of exothermic reaction A→B is 20 and 100kJmol−1 respectively. The enthalpy change of the forward reaction A→B ( in kJ/mol) will be :
A
-120
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B
120
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C
-80
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D
80
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Solution
The correct option is C -80 The given reaction is an exothermic reaction
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,