“…Further, (κ E S ) i jk values for THP (i) + toluene ( j) + p-xylene (k) are smaller than those for THP (i) + toluene ( j) + o-xylene (k) ternary mixtures. This may be due to the A thermodynamic analysis [6] of excess molar volumes, V E , excess molar enthalpies, H E , and excess isentropic compressibilities, κ E S , for THP (i) + benzene or toluene or o-or p-or m-xylene ( j) binary mixtures by graph theory has revealed that that while THP (i) in a pure state exists as an associated molecular entity, i n ; benzene or toluene or o-or p-xylene exist as monomers. If toluene or o-or p-xylene (k) is added to THP (i) + benzene ( j) and o-or p-xylene (k) is added to the THP (i) + toluene ( j) binary mixture, then the ternary THP (i) + benzene ( j) + toluene or o-or p-xylene (k); and THP (i) + toluene ( j) + o-or p-xylene (k) mixture formation may be assumed to involve the following processes: (1) the establishment of (a) i n − j, (b) j − k, and (c) i n − k unlike contacts; (2) unlike contact formation between i n − j, and i n − k would then depolymerize i n to yield monomers of (i); and (3) monomers of (i), ( j), and (k) then undergo specific interactions to yield the i: j, j:k, and i:k molecular entities.…”