In this work, experimental measurements of isobaric heat capacity as well as speed of sound were performed in the compressed
liquid phase of n-undecane from 303.15 to 373.15 K and for pressures ranging up to 60 MPa. These results were used to estimate various thermophysical
properties such as density, isentropic compressibility and isochoric heat capacity in the same ranges of pressure and temperature.
All these sets of data allow checking the thermodynamic consistency between calorimetric, acoustic and volumetric properties.
thermodynamicconsistency of the experimental data was not verified. As recently pointed out [ 6 ], various ways of thermodynamic evaluation can yield different results. In this regard for a good prediction of VLE data in multicomponent systems, the
Authors:Y. Miyake, D. Bessières, F. Plantier, H. Ushiki, and C. Boned
In order to study the influence of stereoisomerism on thermodynamic derived properties, an extensive experimental study has
been carried out for the two stereoisomers of decahydronaphthalene known as cis-and trans-decalin. For both compounds, speed of sound data are reported up to 150 MPa in the temperature range 303.15 to 373.15 K.
Heat capacity measurements are presented up to 60 MPa for temperature ranging from 313.15 to 383.15 K. The experimental speed
of sound together with the heat capacity data were used to estimate densities and compressibilities of the fluids up to 150
MPa. The thermodynamic consistency between volumetric, acoustical and calorimetric properties is then checked. The effect
of stereoisomerism on speed of sound, isentropic compressibility and heat capacity behaviours is analyzed. It is concluded
that the influence observed on these thermodynamic properties mainly results from volumetric effects.
Authors:Ricardo Picciochi, Hermínio Diogo, and Manuel Minas da Piedade
Combustion calorimetry, Calvet-drop sublimation calorimetry, and the Knudsen effusion method were used to determine the standard
(po = 0.1 MPa) molar enthalpies of formation of monoclinic (form I) and gaseous paracetamol, at T = 298.15 K:
were used to assess the predictions of the B3LYP/cc-pVTZ and CBS-QB3 methods for the enthalpy of a isodesmic and isogyric
reaction involving those species. This test supported the reliability of the theoretical methods, and indicated a good thermodynamic
consistency between the