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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 article, the effects of variation of temperature, composition of the binary solvents mixtures and the type of the solvent in the solubility were discussed, and the temperature dependence of the experimental data in binary mixtures was well correlated by the modified Apelblat model.
12 citations
TL;DR: The stability field of scorzalite (FeAl2[OH/PO4]2) was investigated in the P-T range from 487 to 684 °C and 0.1 to 0.3 GPa.
Abstract: The stability field of scorzalite (FeAl2[OH/PO4]2) was investigated in the P-T range from 487 to 684 °C and 0.1 to 0.3 GPa. in hydrothermal experiments. The oxygen fugacity was fixed by the Ni/NiO buffer. Scorzalite shows a decomposition according to the reaction: FeAl2[OH/PO4]2) → FeAlPO5 + AlPO4 (berlinite) + H2O. The mean standard enthalpy and standard entropy of reaction were determined as ΔH
R
0
= 94(13) kJ, ASR = 180(16) JK−1. A57Fe-Mosbauer spectroscopic examination showed that about 4 atomic % of the total Fe in scorzalite is trivalent.
12 citations
TL;DR: In this paper, it was shown that the standard free energy of adsorption of a solute on to a solution/air interface (I´ G°) may be obtained from the limiting slope I± at low concentrations of the surface tension-concentration curve.
Abstract: WE have recently shown1, by a thermodynamical procedure, how the standard free energy of adsorption of a solute on to a solution/air interface (I´ G°) may be obtained from the limiting slope I± at low concentrations of the surface tension-concentration curve. This is given by the equation where I± is—(dy/dc)c=0 and I´ is the thickness of the surface layer, which was identified with the most probable length of the adsorbed molecule. The standard states in bulk and on the surface are hypothetical states in which the solute is at unit activity in each (activity is expressed in molality units), but essentially have all the properties of infinitely dilute solutions.
12 citations
TL;DR: In this paper, the formation thermodynamic properties of crystalline and aqueous inosine have been determined by using a combination of calorimetric techniques, and the standard molar enthalpy of formation Δ f H m ∘ is −(847.9 ± 4.5 ) kJ · mol - 1.
11 citations
TL;DR: In this paper, the B3LYP/6-31G* level was used for the analysis of naphthalene and 75 polybrominated naphalene (PBNs) in the ideal gas phase.
Abstract: The fully optimized calculation of naphthalene and 75 polybrominated naphthalenes (PBNs) in the ideal gas phase were carried out at the B3LYP/6-31G* level. The corresponding thermodynamic parameters, including standard enthalpy, standard Gibbs energy, standard entropy, standard heat capacity at constant volume, and standard thermal energy (i.e., the sum of zero-point energy and thermal energy corrections for molecular translation, rotation, and vibration), were calculated according to temperature correction. In addition, the dependences of some thermodynamic parameters on the number and the position of bromine substituent are discussed. With each additional bromine atom being introduced to the PBNs, the increments of standard entropy and standard heat capacity at constant volume are about 41 J·mol -1 ·k -1 and 17 J·mol -1 ·K -1 , respectively, and the decrease of standard thermal energy is about 48 kJ·mol -1 . By designing isodesmic reactions, the standard enthalpy of formation and the standard Gibbs energy of formation were obtained. On the basis of the magnitude of the relative standard Gibbs energy of formation, the relative stability of PBN isomers was theoretically proposed in this work. Furthermore, comparison of the standard formation enthalpies values, obtained from the B3LYP/6-31G* method as well as four semiempirical methods (AMI, MNDO-d, MNDO, and PM3), was made for PBNs.
11 citations