what is resonance energy???????

the enthalpy of hydrogenation of cyclohexene is -119.5 kJ/mol. if resonance energy of benzene is -150.4kJ/mol,its enthalpy oh hydrogenation would be .............

RESONANCE HYBRID ARE MORE STABLE THAN ANY CANONICAL STRUCTURE . THE DELOCALISATION OF ELECTRONS LOWERS THE ORBITAL ENERGIES , IMPARTING STABILITY  . THE  GAIN IN STABILITY OF RESONANCE HYBRID OVER THE  MORE STABLE OF THE CANONICAL STRUCTURES ,IS CALLED RESONANCE ENERGY.