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L. E. Agafonova, A. I. Druzhinina, R. M. Varushchenko, O. V. Polyakova
The low-temperature heat
capacity and saturation vapour pressure of ethyl ester of butanoic acide
Abstract
The heat capacity, thermodynamic properties of fusion and
purity of the ethyl ester of butanoic acide were determined by adiabatic
calorimetry in the temperature range from 8 to 372 K. The pT-parameters
of the ester for the equilibrium liquid–vapour were measured by comparative
ebulliometry in the "atmospheric" range of the pressure from 10,8 to 101,7 kPa.
Obtained data were used for deriving the normal boiling temperature, Tn.b., the enthalpies of
vaporization at T = 298,15 K and Tn.b., and the main
thermodynamic functions (changes of S, H, G) in the
crystal and liquid states of the temperature interval studied and in the ideal
gas state at T=298,15 K. The experimental vapour pressures of the narrow
temperature interval, DT=62 K were extended to the
entire range of the liquid from triple, T0tp to critical, Tcr, temperatures, Tcr – T0tp =394,3 K.
Copyright (C) Chemistry Dept., Moscow State University, 2002
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