Enthalpies of formation, combustion, and vaporization of the 35 nonanes and 75 decanes

Using an improved correlation procedure based on the trigonal or triatom additivy concept, the standard enthalpies of formation and combustion for the liquid and ideal gaseous states and the standard enthalpy of vaporization for the liquid state at 298.15/sup 0/K are calculated for 35 isomeric nonanes and 75 isomeric decanes. The calculated property values for nonanes and decanes are considered as reliable as the experimental and are recommended for general use. The generalized trigonal additivity procedure is the most accurate of all procedures developed thus far for the correlation of the thermodynamic properties of the alkanes. (28 refs.)