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.
Papers published on a yearly basis
Papers
More filters
TL;DR: In this paper, the heat capacities of hexamethylbenzene-d 18 (HMB-d18 ) were measured at temperatures T between 4 K and 300 K, and the molar entropy of transition is 13.1 J·K −1 ·mol −1, which is 1.41 times as large as that of HMB-h 18.
14 citations
TL;DR: In this paper, the formation of oxonium alunite (OxAl) and KAI was experimentally determined as a function of temperature, from the calorimetric determination of the thermal capacity, the standard formation enthalpy and the standard entropy.
14 citations
TL;DR: In this article, the keto-enol tautomeric equilibrium of 5,5-dimethyl-1,3-cyclohexanedione (dimedone) was investigated using UV-Vis spectroscopy in various solvents, including liquid acetonitrile (CH3CN), supercritical carbon dioxide (SC CO2) and SC CO2-CH 3CN.
Abstract: The keto-enol tautomeric equilibrium of 5,5-dimethyl-1,3-cyclohexanedione (dimedone) was investigated using UV-Vis spectroscopy in various solvents, including liquid acetonitrile (CH3CN), supercritical carbon dioxide (SC CO2) and SC CO2–CH3CN. The content of the enol tautomer in liquid CH3CN is much higher than that in SC CO2. With the addition of a small amount of cosolvent CH3CN into SC CO2, the enol content increases with respect to that in pure SC CO2. The comparison of thermodynamic functions for the tautomerism was made in these solvents. It was found that the change of standard internal energy (ΔU0) in SC CO2–CH3CN is close to that in liquid CH3CN and remarkably different from that in pure CO2. On the other hand, the maximum decrease in the change of the standard entropy (ΔS0) was observed in SC CO2–CH3CN. It indicates that the cosolvent preferentially aggregates about the two tautomers. The ΔS0 becomes the dominant thermodynamic driving force of the tautomerization in the cosolvent-modified SC CO2.
14 citations
TL;DR: In this article, an accurate and a new closed-form representation for the molar entropy of gaseous diatomic molecule substances was presented, which is in excellent agreement with experimental data in a wide range of temperature for CsO, CsF and CsCl molecules.
14 citations
01 Oct 1974-Metallurgical and Materials Transactions B-process Metallurgy and Materials Processing Science
TL;DR: In this article, a study of the volatility of chromic oxide in oxygen-chlorine-argon mixtures in the temperature range 627 to 977°C has been made, using the transpiration technique.
Abstract: A study has been made, using the transpiration technique, of the volatility of chromic oxide in oxygen-chlorine-argon mixtures in the temperature range 627 to 977°C. Under the conditions of the experiments, the volatilization is shown to occur by the reaction Cr2O3(s) + 2Cl2(g) + 1/2O2(g) = 2CrO2Cl2(g). The standard Gibbs free energy change is given by AG° = 90,900(±1200) + 16.46(±1.2)TJ, where the reference state for the gases is one standard atmosphere. Combination of this work with previous structural studies leads to a value for the heat of formation of CrO2Cl2 (g) at 298 K of + 518.2 (±2) kJ/mole.
14 citations