Molar excess volumes, YE, and molar excess enthalpies, HE, have been determined at 298.15 K by using a dilatometer and an LKB flow mlcrocalorlmeter, respectlvely, for benzene (A), toluene (A), o-xylene (A), m-xylene (A), or p-xylene (A) + o-chlorotoluene (B) mlxtures. While both the YE and the H E values are positive for benzene (A) + othlorotduene (B) mlxtures, they are negative for the rest of the binary mixtures. The data have also been compared wlth the avaliabie literature values. Introductlon Recent years have witnessed considerable interest ( 1-7) in the thermodynamic excess properties of halobenzene (A) + aromatic hydrocarbons (B) mixtures. However, considerable disagreement exists between the H E data reported in the literature (7) for the toluene (A) + o-chlorotoluene (B) mixture.
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