Molar excess Gibbs free energies of mixtures of methanol and ethanol with n-decanol were obtained from static vapor pressure measurements over the temperature range 20-50 "C. The molar excess entropies of the system methanol-decanol are predominantly negative at 25 "C; those of ethanol-decanol are positive.
The experimental data of ultrasonic velocity, density, shear viscosity and refractive index for dimethyl substituted pyridines are reanalysed using new methodology to determine the molecular properties. The present work may be hitful for understanding the structure and interactions for the 2,4; 2,6; 3,4; and 3,s dimethyl substituted pyridines as it is directly based on the observed data and relations obtained are different !?om the existing relations.
The molar excess enthalpies and volumes of the systems cyclohexane -cis-decalin and cyclohexanetrans-decalin at 25 'C were determined by direct calorimetric and dilatometric measurements. The Flory theory of mixtures provides a useful basis for a qualitative interpretation of the results.
Static vapor pressure measurements were made on mixtures of 11-propanol with TZ-decanol over the temperature range 2Q-50 "C. From the results, the molar excess Gibbs free energies were calculated. The applicability of the principle of congruence to these values and to similar data published previously for methanol-decanol and ethanol-decanol systems was examined.
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