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Standard molar entropy

About: Standard molar entropy is a research topic. Over the lifetime, 1586 publications have been published within this topic receiving 29886 citations.


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TL;DR: In this paper, the authors derived explicit expressions for the entropy production during reversible polymerization of bifunctional linear polymers whose initial molecular weight distribution can be chosen arbitrarily based on the theory of irreversible thermodynamics.
Abstract: Based on the theory of irreversible thermodynamics explicit expressions are derived for the entropy production during reversible polymerization of bifunctional linear polymers whose initial molecular weight distribution can be chosen arbitrarily. The time-dependent course of the entropy production is explicitly calculated for two cases where the reaction starts (a) from monomer and (b) from monodisperse polymer molecules. In both cases we treat the system to be ideal and the time dependant change of the number of molecules is described by a kinetic approach using two kinetic constants for the forward and backward reactions, respectively. During reversible polymerization the entropy production σred is a monotonously decreasing function approaching zero when the system reaches the equilibrium molecular weight distribution with σred being positive in accordance with the second law of thermodynamics. In case of starting reaction from monodisperse polymer molecules under constraint that the number average chai...

3 citations

Journal ArticleDOI
TL;DR: In this article, the standard entropy, heat capacity at constant pressure, standard enthalpy and standard Gibbs free energy of formation are estimated by application of a two-parameter model, which is relatively simple, accurate and practical.
Abstract: In this paper, the standard entropy, heat capacity at constant pressure, standard enthalpy and standard Gibbs free energy of formation are estimated by application of two-parameter model. The model is relatively simple, accurate and practical. Based on the thermodynamic data for related pure compositions are reported, the five possible chemical reactions in the Cu2O-In2O3 system are studied in the process of preparation CuInO2 by solid reaction method. The relations between equilibrium constant and temperature is plotted. The curves of -T and lgK-1/T for the chemical reactions in the system have also been fitted. The results show that the Cu2O is easy to be oxidized into CuO, which reacts with In2O3 to yield Cu2In2O5 at lower temperature. However, the CuInO2, which is prepared from the Cu2O-In2O3 system, is oxidized into Cu2In2O5 easily in the oxygen atmosphere. The reaction of preparing CIO was reversible and incomplete. Therefore, preparation CIO is very difficult by solid reaction method whether in atmospheric pressure or isolated air and gas shield conditions, because K1 >-40kJ/mol.

3 citations

Journal ArticleDOI
TL;DR: In this paper , the solubility of CO 2 in three protic ionic liquids was measured and experimental data were correlated with Pitzer's model and Soave-Redlich-Kwong cubic equation of state.

3 citations

Journal ArticleDOI
TL;DR: In this paper, the heat capacities of holmium orthovanadate have been measured using precision adiabatic calorimetry and differential scanning caloreimetry over the temperature ranges of 7-343 k and 337-1097 k, respectively.

3 citations

Journal ArticleDOI
TL;DR: In this article , N -Butylethanolammonium trifluoroacetate [BEATFA] and N -butylethanolate ammonium nitrate [BEAN] ionic liquids (ILs) were synthesized and characterized by 1 H NMR.

3 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202316
202229
202141
202055
201949
201857