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. 10 kcal `"mole"^(-1)`
B. 20 kcal `"mole"^(-1)`
C. 40 kcal `"mole"^(-1)`
D. 100 kcal ` " mole"^(-1) `

Answer

A

Explanation

`Delta H=E_(a) -E_(a)^(r ) therefore +5 =15-E_(a)^(r ) therefore E_(a)^(r ) = 10`