An endothermic reaction, `Ararr B` have an activation energy `15 kcal//mol` and the heat of the reaction is `5 kcal//mol`. The activation energy of the reaction, `Brarr A` is:

Options

A. `20` kcal / mole
B. `15` kcal/ mole
C. `10` kcal/mole
D. None of these

Answer

C

Explanation

`DeltaH=E_(a)^(f)-E_(a)^(r)`
`5=15-E_(1)^(r )`
`E_(a)^(r ) =10` k cal/mole