Article

Excess molar volumes and isentropic compressibilities of binary liquid mixtures containing n-alkanes at 298.15 K

Pramana (Impact Factor: 0.56). 01/2002; 59(4):663-670. DOI: 10.1007/s12043-002-0076-6

ABSTRACT Excess molar volumes (V
E) and deviation in isentropic compressibilities (Δβ
s) have been investigated from the density ρ and speed of sound u measurements of six binary liquid mixtures containing n-alkanes over the entire range of composition at 298.15 K. Excess
molar volume exhibits inversion in sign in one binary mixture, i.e., n-heptane + n-hexane. Remaining five binary mixtures,
n-heptane + toluene, cyclohexane + n-heptane, cyclohexane + n-hexane, toluene + n-hexane and n-decane + n-hexane show negative
excess molar volumes over the whole composition range. However, the large negative values of excess molar volume becomes domainant
in toluene + n-hexane mixture. Deviation in isentropic compressibility is negative over the whole range of composition in
the case of all the six binary mixtures. Existence of specific intermolecular interactions in the mixtures has been analyzed
in terms of excess molar volume and deviation in isentropic compressibility.

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