Closure to “Discussion of ‘Standard Free Energy of Formation of Alumina’ [D. Ghosh and D. A. R. Kay (pp. 1836–1845, Vol. 124, No. 12)]”

1978 ◽  
Vol 125 (6) ◽  
pp. 891-891
Author(s):  
D. Ghosh ◽  
D. A. R. Kay
Keyword(s):  
Free Energy ◽  
Standard Free Energy ◽  
Free Energy Of Formation ◽  
Energy Of Formation

Estimation of the Standard Free Energy of Formation of Bastnasite, REFCO3

2019 ◽  
Vol 36 (1) ◽  
pp. 227-233 ◽  
Author(s):  
Isehaq Al-Nafai ◽  
Hojong Kim ◽  
Kwadwo Osseo-Asare
Keyword(s):  
Free Energy ◽  
Standard Free Energy ◽  
Free Energy Of Formation ◽  
Energy Of Formation

High Temperature Electrochemical Determination of the Thermodynamic Stability of the Iron-Rich, Iron-Niobium Intermetallic Phase

1969 ◽  
Vol 24 (10) ◽  
pp. 1580-1585 ◽  
Author(s):  
Giovanni B. Barbi
Keyword(s):  
Free Energy ◽  
Intermetallic Phase ◽  
Standard Free Energy ◽  
Chemical Oxidation ◽  
Electrochemical Determination ◽  
Electrolytic Cell ◽  
Galvanic Cells ◽  
Free Energy Of Formation ◽  
Energy Of Formation

Abstract A non-stationary technique of e.m.f. measurements after polarization of solid galvanic cells, previously applied to the determination of the standard free energy of formation of metal oxides, has been extended to intermetallic phases. The chief condition of applicability of this technique to intermetallic compounds is that the rates of recombination of the cathodic reduction products to yield the stable intermetallic phase be high as compared with that of chemical oxidation at the interface with the solid intermediate electrolyte, due to oxygen impurities in the gas phase. In particular, the solid electrolytic cell:(y values expressing the ε-phase iron-rich boundary compositions according to different authors investigations) was examined.Values of the standard free energy of formation of Fe7-yNb2 from the elements, ranging between-3.77+0.72-10-3 T and -5.66+1.09 · 10-3 T kcal/atom were found.

scholarly journals THE COUPLED REDOX POTENTIAL OF THE LACTATE-ENZYME-PYRUVATE SYSTEM

1933 ◽  
Vol 16 (6) ◽  
pp. 961-976 ◽  
Author(s):  
J. Percy Baumberger ◽  
J. J. Jürgensen ◽  
Kathleen Bardwell
Keyword(s):  
Free Energy ◽  
Lactic Acid ◽  
Redox Potential ◽  
Pyruvic Acid ◽  
Standard Free Energy ◽  
Redox Potentials ◽  
Lactic Acid Dehydrogenase ◽  
Acid Dehydrogenase ◽  
Free Energy Of Formation ◽  
Energy Of Formation

1. The term "coupled redox potential" is defined. 2. The system lactic ion See PDF for Equation pyruvic ion + 2H+ + 2e is shown to be reversible (when the enzyme is lactic acid dehydrogenase) and its coupled redox potential between pH 5.2 and 7.2 at 32°C. is: See PDF for Equation 3. The free energy of the reaction: lactic ion (1m) → pyruvic ion (1m) = -ΔF = –14,572. 4. The standard free energy of formation (ΔF298) of pyruvic acid (l) is estimated at –108,127. This is merely an approximation as some necessary data are lacking. 5. The importance of coupled redox potentials as a factor in the regulation of the equilibrium of metabolites is indicated.

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