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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 effects of binary solvents composition and temperature on the solubility of wedelolactone were discussed and it was found that wedeloline solubilities in (water + erythropoietin) mixed (water-ethanol) mixed-solvents presented a monotonic effect in the studied region.
13 citations
TL;DR: The thermodynamics of the interactions between the anionic dye Acid Red 88 (AR88) and the cationic surfactant dodecyltrimethylammonium bromide (DTA) in the aqueous solution of Triton X-100 (TX100) at different temperatures has been investigated by using potentiometry as mentioned in this paper.
13 citations
TL;DR: In this article, the liquid phase addition of 2-propanol to isobutene to give isopropyl tert-butyl ether (IPTBE) was determined experimentally in the temperature range 303−353 K and at 1.6 MPa.
Abstract: Equilibrium constants for the liquid-phase addition of 2-propanol to isobutene to give isopropyl tert-butyl ether (IPTBE) were determined experimentally in the temperature range 303−353 K and at 1.6 MPa. To reach etherification equilibrium, the macroporous sulfonic resin Bayer K-2631 was used as the catalyst. The UNIFAC estimates of activity coefficients were used to describe the liquid-phase nonideality. The thermodynamic equilibrium constants and the enthalpy, free energy, and entropy changes of the reaction were given as a function of temperature. At 298.15 K, the standard molar reaction enthalpy ΔrH°m(298.15 K) is −(22.9 ± 1.3) kJ·mol-1, in agreement with literature data, and the standard molar reaction entropy ΔrS°m(298.15 K) and free energy ΔrG°m(298.15 K) are −(60.3 ± 0.5) J·(mol·K)-1 and −(4.9 ± 1.4) kJ·mol-1, respectively. Finally, at 298.15 K the standard molar enthalpy of formation ΔfH°m(l, 298.15 K) and the standard molar entropy of IPTBE S°m(l, 298.15 K) were estimated to be −(378.5 ± 2.7) kJ...
13 citations
TL;DR: In this paper, low-temperature adiabatic calorimetry was used to determine the molar heat capacity and other thermodynamic properties of KHSO 5 (cr).
13 citations
TL;DR: In this article, the standard Gibbs energies of formation, ΔfGm,T°, below and above the critical temperatures of polymorphs, magnetic, and superconductive phase transitions are determined.
Abstract: The standard Gibbs energies of formation, ΔfGm,T°, below and above the critical temperatures of polymorphs, magnetic, and superconductive phase transitions are necessary to clarify the driving forces for such phase transitions. However, they have remained unsolved due to experimental difficulties. In the present study, the ΔfGm,T° values of the ferro- and paramagnetic phases of AlNd3 were directly determined. The standard entropy of formation, ΔfSm,T°, was determined from the heat capacity, Cp,m°, from 2 to 300 K. The standard enthalpies of formation, ΔfHm,T°, were determined by combining Cp,m° with the standard enthalpy of formation at 298 K, ΔfHm,298°, obtained by acid-solution calorimetry. The magnetization, M, was measured by a magnetic balance. The ΔfGm,T° values obtained by combining the ΔfSm,T° and ΔfHm,T° values indicate that the phase transition occurs at 73.47 K, i.e., the Curie point, consistent with the spontaneous magnetization from para- to ferromagnetic phases clarified by measuring M. The ...
13 citations