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/mol
B. 20 kcal/mol
C. 40 kcal/mol
D. 100 kcal/mol

Answer

A

Explanation

`DeltaH=E_(a)-E_(a)^(r)`
`therefore+5=15-E_(a)^(r)`
`thereforeE_(a)^(r)=10k` cal/mol