The polymerization of ethylene to linear polyethene is represented by the reaction nCH2=CH2→--CH2-CH2--n where ‘n’ has large integral value. Given that average enthalpies of bond dissociation for C=C and C-C at 298K are +590 and +331KJ mol−1 respectively. Calculate the enthalpy of polymerization per mole of ethylene at 298K.