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Estimation of Evaporation Enthalpy of Pure Compounds at 298.15K by a New Molecular Connectivity Index Method

A New Molecular Connectivity Index method used to calculate the vaporization enthalpy value at 298.15K is proposed. The valance values of the one hundred and seventy compounds include alkanes, alkenes, chloro or bromoalkanes, cycloalkanes and aromatic hydrocarbons were calculated. The result showed five closed correlations of their vaporization enthalpy value with their new molecular connectivity index, the correlation coefficients are 0.992, 0.994, 0.893, 0.996 and 0.981, the relative errors are 3.4%, 2.1%, 4.8%, 1.4% and 1.8%.