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 equilibrium vapor pressure of methylammonium bromide was measured as a function of temperature in the range of 433-503 K, and the measured value of sublimation enthalpy was found to be in agreement with that directly calculated from the available thermodynamic data.
7 citations
TL;DR: In this paper, the effect of column tenperature on the capacity factor and selectivity of dipeptide isomers was investigated, and it was shown that the difference of their standard entropy change played more important role in the selectivity value than that of standard enthalpy change does.
Abstract: The effect of column tenperature on the capacity factor and selectivity of dipeptide isomers was investigated. It has been, observed that the variation in the logarithm of the capacity factor of dipeptide isomers is linearly dependent on the reciprocal of the absolute column temperature. The standard enthalpic change for dipeptide isomers is almost a constant, and the selectivity value is almost independent of the column temperature. It can be concluded that (1) the enthalpy change of dipeptide isomers in RP-HPLC is mainly determined by the molecular interaction in the mobile phase and (2) the difference of their standard entropy change play more important role in the selectivity value than that of standard enthalpy change does.
7 citations
TL;DR: In this paper, the equilibrium constants for the liquid-phase dehydration of 1-octanol to 1-(octyloxy)octane (DNOE) and water have been determined in the temperature range (413 to 453) K over Amberlyst 70.
Abstract: The equilibrium constants for the liquid-phase dehydration of 1-octanol to 1-(octyloxy)octane (DNOE) and water have been determined in the temperature range (413 to 453) K over Amberlyst 70. The equilibrium constants for the main side reactions, intramolecular dehydration of 1-octanol to 1-octene and 1-octene isomerization to 2-octene, have been determined as well. Etherification of 1-octanol was shown to be exothermic, with reaction enthalpy change of (−13.6 ± 1.7) kJ·mol–1 at 298.15 K. The standard formation enthalpy of 1-(octyloxy)octane was computed to be (−581 ± 2) kJ·mol–1, in good agreement with the estimated value by a modified Benson method. A standard molar entropy of (658 ± 4) J·mol–1·K–1 in the liquid phase has been found for 1-(octyloxy)octane from the entropy change of reaction at 298.15 K. Intramolecular dehydration of 1-octanol has been found to be endothermic and isomerization of 1-octene to 2-octene exothermic.
7 citations
TL;DR: In this paper, an equation using the critical volume fraction and segment number of polystyrene was proposed for the partial molar entropy change of a polymer for mixing in dilute solution.
7 citations
TL;DR: In this article, the aggregation behavior and thermodynamics of micellization of three gemini surfactants with diamide groups and rigid spacers in various volume percentages of ethylene glycol (EG-WR), and three different types of 10% organic co-solvents (MA-WR, DMF-WR and AN-WR) across a range of temperature from (281.15 to 331.15) K, have been investigated by electrical conductivity measurements.
7 citations