Partial Molar Heat Capacities and Partial Molar Volumes of All of the Isomeric (C3 to C5) Alkanols at Infinite Dilution in Water at 298.15 K

Apparent molar heat capacities and apparent molar volumes were measured for all isomeric C3 to C5
alkanols in their dilute aqueous solutions at 298.15 K using a differential flow microcalorimeter in
conjuntion with a vibrating-tube densimeter. Molar volumes and molar heat capacities of the pure alkanols
(except for 2-methyl-2-propanol and 2,2-dimethyl-1-propanol, which are solid at 298.15 K) were determined
using the same instrumentation. The concentration dependence of the apparent properties allowed the
determination, through extrapolation, of the infinite dilution partial molar volumes

and heat
capacities

of these alkanols in water. These values, combined with the respective pure liquid
properties, produced the limiting partial molar excess quantities (

,

). The present measurements agree well with available literature values. The group contribution schemes of Cabani et al. (Cabani,
S.; Gianni, P.; Mollica, V.; Lepori, L. Group Contribution to the Thermodynamic Properties of Non-Ionic
Organic Solutes in Dilute Aqueous Solution. J. Solution Chem. 1981, 10, 563−595) and of Plyasunov
and Shock (Plyasunov, A. V.; Shock, E. L. Thermodynamic Functions of Hydration of Hydrocarbons at
298.15 K and 0.1 MPa. Geochim. Cosmochim. Acta 2000, 64, 439−468) were used to predict the limiting
partial molar properties. It was found that the predictions of both schemes are very good.