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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 standard molar enthalpies of combustion Δ c H m ° at T =298.15 K were measured by Calvet microcalorimetry.
28 citations
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TL;DR: In this article, Clausius et al. measured the equilibria of the vaporization of copper(I) halides by means of a static method and found that the predominant species in the vapour are the trimeric ones.
Abstract: Die Verdampfungsgleichgewichte der Kupfer(I)-halogenide wurden mit einer statischen Methode gemessen. Der Dampf besteht uberwiegend aus Trimeren. Folgende Verdampfungsenthalpien und -entropien bei 1 100 K wurden bestimmt (in kcal/Mol bzw. Clausius): CuCl: 42,7; 23,8; Cu2Cl2: 43,1; 19,7; Cu3Cl3: 18,4; 10,0; Cu4Cl4: 15,5; 5,9; Cu3Br3: 19,6; 11,3; Cu4Br4: 24,0; 7,8; Cu3J3: 25,1; 14,8.
Unter Hinzuziehung der Beobachtungen beim chemischen Transport von Cu mit Jod wurde die Standardentropie bei 298 K fur Cu3J3,g erhalten zu 130 cl und die Bildungsenthalpie zu 20 kcal/Mol.
Thermodynamics of the Vaporization of Copper(I) Halides
The equilibria of the vaporization of copper(I) halides were measured by means of a static method. The predominant species in the vapour are the trimeric ones. The enthalpies and entropies of vaporization (kcal/mol and e. u./mol) at 1 100 K were determined to be 42.7 and 23.8 fur CuCl, 43.1 and 10.7 for Cu2Cl2, 18.4 and 10.0 fur Cu3Cl3, 15.5 and 5.9 for Cu4Cl4, 10.6 and 11.3 for Cu3Br3, 24.0 and 7.8 for Cu4Br4, 25.1 and 14.8 for Cu3I3, respectively. Taking into account the results of chemical transport experiments concerning the transport of copper by means of iodine, the standard entropy at 298 K of Cu3I3(gas) was found to be 130 e. u./mol and the fusion enthalpy at 298 K was determined to be 20 kcal/mol.
28 citations
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TL;DR: In this article, a homogeneous, colorless ionic liquid analogous containing choline chloride and magnesium chloride hexahydrate is reported, which is preliminarily investigated by Fourier transform infrared spectroscopy (FTIR).
28 citations
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TL;DR: In this paper, the micellization behavior of a cationic gemini surfactant, hexanediyl-1,6-bis(dimethylcetylammonium bromide) (16-6-16), at different fixed temperatures and fixed concentration of dextrose in aqueous solutions was reported.
Abstract: In the present study, we report the micellization behavior of a cationic gemini surfactant, hexanediyl-1,6-bis(dimethylcetylammonium bromide) (16-6-16) at different fixed temperatures and fixed concentration of dextrose in aqueous solutions. The critical micelle concentration (cmc) of 16-6-16, measured by the conductivity and dye solubilization methods. An increasing trend of the cmc values were found with additive (dextrose) concentrations. A similar cmc values increasing trend were found with the temperatures (i.e., increases with increasing temperature). The thermodynamic parameters, viz., standard Gibbs energy (), standard enthalpy (), and standard entropy () of micellization of 16-6-16, are evaluated. The values indicate less stability of the 16-6-16 solution in the presence of dextrose.
28 citations
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TL;DR: Removal of Pb2+ ions from aqueous solution using the adsorption process onto Ti-MCM-41 has been investigated and dynamic modeling and equilibrium modeling showed that the first-order reversible kinetic model held for the adsOrption process.
28 citations