The activation energy of exothermic reaction `ArarrB` is 80 kJ `"mol"^(-1)` . The heat of reaction is `200 kJ "mol"^(-1)`. The activation energy for the reaction`Brarra` ( in kJ/mol) will be :
A. 80
B. 120
C. 40
D. 280

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1 Answers

`DeltaH=E_(f)-E_(b)`
`-200=80-E_(b)`
`E_(b)=280` kJ/mol

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