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 standard entropy S 0 (298.15 K) of AmCl 2 has been estimated by extrapolation of the available data for the lanthanide(II) chlorides to the actinide series.
10 citations
TL;DR: A new Mn (III) Schiff-base coordination compound, [Mn(L)(NCS)]2 (H2L = N,N′-bis(5-chlorosalicylidene)-1,2-diaminoethane), has been synthesized and characterized structurally and magnetically.
10 citations
TL;DR: In this article, the molar enthalpy of formation Δ f H m of the liquid alloys { x Pd+(1− x )Si} at 1723 K was measured by direct reaction calorimetry (drop method) using a very high-temperature Setaram calorimeter.
10 citations
TL;DR: In this article, the standard enthalpy and standard entropy changes at 25°C for the trimerisation of liquid acetaldehyde to form liquid paraldehyde are shown to be thermodynamically unpolymerisable.
Abstract: Equilibrium constants for reaction (1) 3CH3CHO(g)⇌(CH3CHO)3(g)(1) have been measured in the temperature range 19 to 40°C. The results can be expressed by eqn (2). log(Kp/m4 kN–2)=(6.97 ± 0.09)103K/T–(27.90 ± 0.30)(2) The standard enthalpy and standard entropy changes at 25°C for the trimerisation of liquid acetaldehyde to form liquid paraldehyde are ΔH°298=–98.1 kJ (mol paraldehyde)–1 and ΔS°298=–299.5 J K–1(mol paraldehyde)–1. Liquid paraldehyde is shown to be thermodynamically unpolymerisable.
10 citations
TL;DR: In this paper, the critical micelle concentration (CMC) of surfactant-III-dodecylamine complexes of the type cis-α-[Cr(trien)(C12H25NH2)X]2+ has been studied in n-alcohol and in formamide at different temperatures, by electrical conductivity measurements.
Abstract: The critical micelle concentration (CMC) of surfactant–Cr(III)–dodecylamine complexes of the type cis-α-[Cr(trien)(C12H25NH2)X]2+ (where trien = triethylenetetramine; X = F−, Cl−, Br−) has been studied in n-alcohol and in formamide at different temperatures, by electrical conductivity measurements. From the CMC values as a function of temperature, various thermodynamic properties have been evaluated: standard Gibbs energy changes (Δmic
G
0), standard enthalpy changes (Δmic
H
0) and standard entropy changes (Δmic
S
0) for micellization. Critical micelle concentrations have also been measured as a function of the percentage composition of alcohol added. The solvent composition dependences of these thermodynamic parameters were determined. It is suggested that alcohol addition leads to an increase in formamide penetration into the micellar interface that depends on the alcohol’s chain length. The results are discussed in terms of an increased hydrophobic effect, dielectric constant of the medium, the chain length of the alcohols, and the surfactant in the solvent mixture.
10 citations