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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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Journal ArticleDOI
Tzi-Yi Wu1, Bor Kuan Chen2, Lin Hao, Yu Chun Peng2, I-Wen Sun 
TL;DR: The surface thermodynamic functions, such as surface entropy, enthalpy, as well as standard molar entropy, Parachor, and molarEnthalpy of vaporization for pure ionic liquid, have been derived from the temperature dependence of the surface tension values.
Abstract: A systematic study of the effect of composition on the thermo-physical properties of the binary mixtures of 1-methyl-3-pentyl imidazolium hexafluorophosphate [MPI][PF6] with poly(ethylene glycol) (PEG) [Mw = 400] is presented. The excess molar volume, refractive index deviation, viscosity deviation, and surface tension deviation values were calculated from these experimental density, ρ, refractive index, n, viscosity, η, and surface tension, γ, over the whole concentration range, respectively. The excess molar volumes are negative and continue to become increasingly negative with increasing temperature; whereas the viscosity and surface tension deviation are negative and become less negative with increasing temperature. The surface thermodynamic functions, such as surface entropy, enthalpy, as well as standard molar entropy, Parachor, and molar enthalpy of vaporization for pure ionic liquid, have been derived from the temperature dependence of the surface tension values.

24 citations

Journal ArticleDOI
TL;DR: In this paper, Monte Carlo simulations on lattices of variable defect content were performed to study the effect of point defects on the entropy profiles of Li-ion batteries, and the results of these simulations were compared to the results obtained from the experimentally observed ones.

24 citations

Journal ArticleDOI
TL;DR: In this paper, the carbonate complexation of curium(III) in aqueous solutions with high ionic strength was investigated below solubility limits in the 10-70 C temperature range using time-resolved laser-induced fluorescence spectroscopy (TRLFS).
Abstract: The carbonate complexation of curium(III) in aqueous solutions with high ionic strength was investigated below solubility limits in the 10-70 C temperature range using time-resolved laser-induced fluorescence spectroscopy (TRLFS). The equilibrium constant, K3, for the Cm(CO3)2- + CO32- Cm(CO3)33- reaction was determined (log K3 = 2.01 ± 0.05 at 25C, I = 3 M (NaClO4)) and compared to scattered previously published values. The log K3 value for Cm(III) was found to increase linearly with 1/T, reflecting a negligible temperature influence on the corresponding molar enthalpy change, rH3 = 12.2 ± 4.4 kJ mol-1, and molar entropy change, rS3 = 79 ± 16 J mol-1 K-1. These values were extrapolated to I = 0 with the SIT formula (rH3 = 9.4 ± 4.8 kJ mol-1, rS3 = 48 ± 23 J mol-1 K-1, log K3 = 0.88 ± 0.05 at 25C). Virtually the same values were obtained from the solubility data for the analogous Am(III) complexes, which were reinterpreted considering the transformation of the solubility-controlling solid. The reaction studied was found to be driven by the entropy. This was interpreted as a result of hydration changes. As expected, excess energy changes of the reaction showed that the ionic strength had a greater influence on rS3 than it did on rH3.

24 citations

Journal ArticleDOI
TL;DR: In this paper, the equilibrium modeling for adsorption of cationic dye Methylene Blue onto Yemen natural clay at different temperatures, particle size and solution pH was studied.
Abstract: The equilibrium modeling for adsorption of cationic dye Methylene Blue (MB) onto Yemen natural clay at different temperatures, particle size and solution pH was studied. The adsorption capacity was found to be increase with increasing temperature and pH and decreased with increasing particle size. The maximum adsorption capacity was 500.0 (mg g−1) at T = 25°C, dp = 250−355 μm and pH = 12. The data are successfully tested by Langmuir, Freundlich, Temkin and Redlich–Peterson models. It was found that the Redlich–Peterson isotherm best fit the experimental data over the whole concentration range. Thermodynamic parameters such as standard Gibbs free energy (ΔG°), standard enthalpy (ΔH°), and standard entropy (ΔS°) were calculated. The thermodynamic parameters of methylene blue/clay system indicated spontaneous and endothermic nature of the adsorption process. The results demonstrate that Yemen natural clay is very effective in the removal of MB from aqueous solution and can be used as alternative of ...

24 citations

Journal ArticleDOI
TL;DR: In this article, the standard molar enthalpies of 1-phenylpyrrole and 1-(4-methylphenyl) pyrrole were derived using the Knudsen mass-loss effusion method.

24 citations


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