The Following Is an Energy Diagram for the Conversion of a

The following is an energy diagram for the conversion of A ? B ?C. The energies of activation and DH's for each step are also given. Calculate DH overall as shown on the energy diagram for A ? B ? C.

Ea (A ?B) =+10 Kcal
Ea (B?C) =+4 Kcal
DH (A ?B) =+8 Kcal
DH (B ?C) =-5 Kcal

A) +9 kcal
B) +7 kcal
C) None of these
D) +3 Kcal