Standard Molar Free Energy of Formation of Uranium Dicarbide and Uranium Sesquicarbide by Electromotive Force Measurements

1966 ◽  
Vol 113 (4) ◽  
pp. 376 ◽  
Author(s):  
W. K. Behl ◽  
J. J. Egan
Keyword(s):  
Free Energy ◽  
Electromotive Force ◽  
Force Measurements ◽  
Molar Free Energy ◽  
Free Energy Of Formation ◽  
Electromotive Force Measurements ◽  
Energy Of Formation

The Solubility of Metallic Selenium under Anoxic Conditions

2000 ◽  
Vol 663 ◽  
Author(s):  
Yoshihisa Iida ◽  
Tetsuji Yamaguchi ◽  
Shinichi Nakayama ◽  
Tomoko Nakajima ◽  
Yoshiaki Sakamoto
Keyword(s):  
Free Energy ◽  
Solid Phase ◽  
Equilibrium Constants ◽  
Absorption Spectrometry ◽  
X Ray Diffraction ◽  
Molar Free Energy ◽  
Anoxic Conditions ◽  
X Ray ◽  
Free Energy Of Formation ◽  
Energy Of Formation

ABSTRACTThe solubility of metallic selenium was measured in a mixture of 0.1M-NaCl and 0.05M-N2H4under anoxic conditions (O2 < 1 ppm) by both oversaturation and undersaturation methods. Equilibrium was attained in 40 days. The aqueous selenium species identified were HSe at pH between 5 and 8, and Se42at pH between 10 and 13, by UV-Vis absorption spectrometry. The solid phase was identified as Se (cr) by X-ray diffraction. The equilibrium constants ofSe(cr) + H+ + 2e- = HSe- logK0 = -6.5±0.5 and4Se(cr) + 2e- = Se42- logK0 = -16.8±0.5were determined. The standard molar free energy of formation of HSe- and Se42-was determined to be (37.1±2.9) and (95.9±2.9) kJ/mol, respectively.

Thermodynamics of the interaction of HCl with D-xylose in water at 278.15-318.15 K

1999 ◽  
Vol 77 (2) ◽  
pp. 232-236 ◽  
Author(s):  
Jianji Wang ◽  
Kelei Zhuo ◽  
Qiufen Zhang ◽  
Jinsuo Lu
Keyword(s):  
Free Energy ◽  
Thermodynamic Parameters ◽  
Electromotive Force ◽  
Theoretical Models ◽  
Pair Interaction ◽  
Refractive Indices ◽  
Force Measurements ◽  
Electromotive Force Measurements ◽  
The Mean ◽  
Hydroxy Groups

The thermodynamic parameters of interaction of HCl with D-xylose in water were determined from electromotive force measurements from 278.15 to 318.15 K. The correlation between the pair interaction Gibbs free energy parameters for HCl-sugar (gHCl-S) and the mean number (n(e-OH)) of equatorial hydroxy groups in sugar molecules was found to be gHCl-S/J kg mol-2 = (41.2 ± 2.1) + (16.88 ± 0.52)n(e-OH). Refractive indices of aqueous D-xylose solutions were measured and used to evaluate the polarizability of D-xylose molecule in water. Several theoretical models were used to calculate the salting constant of D-xylose. The results show that the calculated values are reasonably in agreement with the experimental ones.Key words: thermodynamics, HCl, D-xylose, interaction parameter, salting constant.

Thermodynamic Investigation of the Reaction: by Electromotive Force Measurements

1971 ◽  
Vol 49 (9) ◽  
pp. 1545-1549 ◽  
Author(s):  
A. W. Espelund ◽  
S. N. Flengas
Keyword(s):  
Free Energy ◽  
Thermodynamic Properties ◽  
Electromotive Force ◽  
Electrochemical Method ◽  
Standard Free Energy ◽  
Reference Electrode ◽  
Standard Free Energy Change ◽  
Force Measurements ◽  
Thermodynamic Investigation ◽  
Electromotive Force Measurements

The thermodynamic properties of the system CoO–CoSO4 have been investigated over the temperature range 560 to 916 °C, by an electrochemical method using a ZrO2–CaO solid electrolyte and an oxygen reference electrode. The standard free energy change for the reaction[Formula: see text]can be expressed by[Formula: see text]and is given with an accuracy of ± 400 cal.

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