Activation energy of the reaction `AtoB+38KCal` is 20KCal. Then activation energy of reaction `BtoA` bill be :-

Options

A. 20 KCal
B. `-20 KCal`
C. 18 KCal
D. 58KCal

Answer

D

Explanation

`DeltaH=(Ea)f-(Ea)b`
`-38=20-Ea_(f)`