Excess molar volumes ofn-alkanes-thiophene mixtures at 25°C

The excess molar volumes of binary mixtures of n-hexane, n-octane, n-decane, n-dodecane, and n-hexadecane with thiophene have been measured at 25°C over the whole mole fraction range. All the experimental values, except those for n-hexane-thiophene in the thiophene rich region, are positive. The Flory theory was used to determine the influence of molecular contact sites on the excess volumes. A new calculation procedure has been suggested by introducing a new parameter S. This method greatly improved the theoretical results.