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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 paper, the relation among the dissociation pressure, the heat of formation, and the strain energy of metal hydrides, thermodynamically, was analyzed by the thermodynamic relations including strain energy.
8 citations
TL;DR: In this article, the Clausius-Clapeyron equation was used to calculate the standard molar enthalpy of sublimation of 2,5-dibromonitrobenzene in the crystalline phase.
8 citations
TL;DR: In this article, the authors used the Planck-Einstein approach to evaluate the heat capacity data and obtain a more accurate value for the standard entropy at 298.15 K for α-quartz, α-cristobalite and amorphous∖liquid phases.
Abstract: Thermodynamic description of pure SiO2 at 1 atm was developed for the whole temperature range including the crystalline, supercooled liquid and amorphous phases. Thermodynamic properties of the crystalline phases were assessed using an extended Einstein model. The thermodynamic modelling was based on the critically assessed experimental heat capacity and enthalpy increment data and on the data on phase transitions. The Planck-Einstein approach was used to evaluate the heat capacity data and obtain a more accurate value for the standard entropy at 298.15 K for α-quartz, α-cristobalite and amorphous∖liquid phases. The value for the standard entropy for the amorphous phase obtained just from the assessment of heat capacity data and did not include non-zero residual entropy at 0 K. The liquid and amorphous phases were thermodynamically described as one phase using the two-state liquid model. It was shown that Gibbs energy expression for amorphous silicon dioxide could be evaluated without inclusion of non-zero entropy at 0 K.
8 citations
TL;DR: In this paper, the effect of various process parameters such as pH, temperature, contact time, biosorbent dosage and desorption were studied for the removal of Cr (VI) ions from aqueous solutions.
Abstract: In the present study, biomass of Agaricus campestris was tested to evaluate its effectivity as a biosorbent for the removal of Cr (VI) ions from aqueous solutions. The influence of various process parameters such as pH, temperature, contact time, biosorbent dosage and desorption were studied. Pseudo-first order, pseudo-second order, Ritchies and intraparticle diffusion model were used to present the adsorption kinetics. Results obtained indicate that the adsorption process is fast and spontaneous within the first 60 min. The experimental data supports pseudo-second order model. The sorption data conformed well to the Langmuir isotherm model. The maximum adsorption capacity (qmax) onto A. campestris was 56.21 mg g-1 for Cr(VI) at 45°C when 0.1 g biomass was used. In addition, the mean values of thermodynamic parameters of standard free energy (ΔG0 = -1.635 kJ mol-1 at 45°C), standard enthalpy (ΔH0 = -9.582 kJ mol-1) and standard entropy (ΔS0 = -24.992 J mol-1K-1) of the adsorption mechanism were determined.
8 citations
TL;DR: In this paper, the enthalpy change associated with the γ-β (orthorhombic to hexagonal) crystal-line transition for a specimen of barium carbonate standard (NBS-SRM 760) which is sold for temperature calibration of differential thermal analyzers was studied.
8 citations