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 article, the temperature dependence of soil water vapor presure was studied with a psychrometric vapor pressure technique in the range of 0.96 to 1.00 relative vapor pressures.
Abstract: The temperature dependence of soil water vapor presure was studied with a psychrometric vapor pressure technique in the range of 0.96 to 1.00 relative vapor pressures and below 0.96 with gravimetric and calorimetric heat of immersion techniques. For Millville silt loam at constant water content, the relative vapor pressure decreased with increasing temperature. Both differential and integral entropy values were calculated. The difference between the partial molar entropy of pure free water vapor and the partial molar entropy of adsorbed water led to the conclusion that soil water molecules are arranged, on the average, less randomly than water vapor molecules. At the same time, comparison with the entropy of vaporization of pure water suggested a more random arrangement of molecules in soil water than in free liquid water.
10 citations
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TL;DR: In this article, the massic energies of combustion in fluorine were measured in a bomb calorimeter and the standard molar enthalpy of formation ΔfHmo(Mo3Si, cr, 298.15 K) determined to be −(125.2 ± 5.8) kJ ·mol−1.
10 citations
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TL;DR: In this paper, the authors derived thermodynamic properties of tungsten carbide from heat capacities measured by adiabatic calorimetry in the range 10-1000 K on a sample rich in this phase.
10 citations
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TL;DR: In this paper, the standard enthalpies of combustion in oxygen at T = 298.15 K, measured by combustion calorimetry, were derived for all the studied compounds in gas-phase, together with appropriate isodesmic, homodesmic reactions.
Abstract: The standard (po = 0.1 MPa) molar enthalpies of formation in the condensed state of chromone-3-carboxylic acid and coumarin-3-carboxylic acid were derived from the standard molar energies of combustion in oxygen at T = 298.15 K, measured by combustion calorimetry. The standard molar enthalpies of sublimation were obtained by Calvet microcalorimetry. From these values the standard molar enthalpies in the gaseous phase, at T = 298.15 K, were derived. Additionally estimates of the enthalpies of formation, of all the studied compounds in gas-phase, were performed using DFT and other more accurate correlated calculations (MCCM and G3MP2), together with appropriate isodesmic, homodesmic or atomization reactions. There is a reasonable agreement between computational and experimental results.
10 citations
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TL;DR: Clausius inequality of open systems can be derived by use of the defining inequalities which establish the non-equilibrium quantities contact temperature and non-Equilibrium molar entropy which allow to describe the interaction between the Schottky system and its controlling equilibrium environment.
Abstract: Meixner's historical remark in 1969 "... it can be shown that the concept of entropy in the absence of equilibrium is in fact not only questionable but that it cannot even be defined...." is investigated from today's insight. Several statements --such as the three laws of phenomenological thermodynamics, the embedding theorem and the adiabatical uniqueness-- are used to get rid of non-equilibrium entropy as a primitive concept. In this framework, Clausius inequality of open systems can be derived by use of the defining inequalities which establish the non-equilibrium quantities contact temperature and non-equilibrium molar entropy which allow to describe the interaction between the Schottky system and its controlling equilibrium environment.
10 citations