Topic
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 average value of the entropy of the aqueous SeO 4 2− ion is S=5.5 ± 0.3 entropy units, and for the reaction Pbsolid + Sesolid + 2O2=PbSeO4 ΔH298 == -148.7 Cal/mole and ΔF298 = -120.5 Cal /mole.
Abstract: 1.
As a result of the measurements described in our article it has been found that for the reaction Basolid + Sesolid + 2O2=BaSeO4, ΔH298=-279.2 Cal/mole and ΔF298=-249.1 Cal/mole; and for the reaction Pbsolid + Sesolid + 2O2=PbSeO4 ΔH298 == -148.7 Cal/mole and ΔF298=-120.5 Cal/mole.
2.
From the thermodynamic data for H2SeO4, SrSeO4, BaSeO4, PbSeO4, and Tl2SeO4 the average value of the entropy of the aqueous SeO 4 2− ion is S=5.5 ± 0.3 entropy units.
1 citations
TL;DR: In this article, the temperature dependence of the heat capacity of crystalline pentasodium hafnium tris(phosphate) was studied over the temperature range 6-650 K.
Abstract: The temperature dependence of the heat capacity of crystalline pentasodium hafnium tris(phosphate) was studied over the temperature range 6–650 K. The experimental data were used to calculate the thermodynamic functions of Na5Hf(PO4)3 from 0 to 650 K and the fractal dimension at 20–50 K. The standard entropy of formation from simple substances at 298.15 K was calculated from the absolute entropy value. The thermodynamic properties of Na5M(PO4)3 (M = Ti, Zr, and Hf) phosphates were compared.
1 citations
01 Jan 2000
TL;DR: In this article, the authors explored the application of the tetraphenylarsonium tetrahenyl borate (TATB) assumptions in obtaining the hydration entropy of ions and compared the results with those based on the widely accepted estimate of the standard entropy of the aqueous hydrogen i on based on thermocell data.
Abstract: The hydration entropy of ions is calculated from their entropy in the ideal gaseous state and the standard entropy of their aqueous solutions. The application of the tetraphenylarsonium tetraphenyl borate (TATB) and the cognate tetraphenyl phosphonium tetraphenyl borate (TPTB) assumptions in obtaining the latter is explored, using newly determined heat capacity data for crystalline tetraphenyl phosphonium and arsonium perchlorates, their redetermined solubility data, both over a temperature interval, and data from the literature. The results are compared with those based on the widely accepted estimate of the standard entropy of the aqueous hydrogen i on based on thermocell data.
1 citations
Journal Article•
TL;DR: In this paper, the column temperature has a significant influence on the retention and selectivity for separation of 6 flavonoid glycosides and a new type of chromatographic stationary phase, cholesterol bonded stationary phase was discussed.
1 citations
TL;DR: In this article, low-temperature heat capacity (LTHC) measurements of one of the U-Si phases, U3Si5, using a Quantum Design Physical Properties Measurement System (PPMS) from 2.4 to 397.4 K were presented.
1 citations