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Question

The forward and backward activation energy of exothermic reaction AB is 80 and 280 kJ mol1 respectively. The enthalpy change of the forward reaction AB ( in kJ/mol) will be :

A
-200
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B
-360
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C
-280
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D
-80
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Solution

The correct option is A -200
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,

ΔH=EaFEaB

ΔH=EfEb
ΔH=80280
ΔH=200kJ/mol

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