Calculate the resonance energy of isoprene `(C_(5)H_(8))` from the data given.
The standard heat of sublimation of graphite is `718 K kJ"mole"^(-1)` and heat of formation `C_(5)H_(8)(g)` is `79 kJ` mole.
(Give your answer in kcal `"mole"^(-1)` , approximate integer.)
