Fugacity of oxygen

The systems with added iron-containing materials would amount to mineral buffer systems which should define the fugacities of oxygen and sulfur until one or more of the components of the buffer has been consumed. In general, all of the experiments have been made on thermodynamically undetermined systems, that is, not enough information has been obtained to define the systems. 

For solutions in which the activity of water and the fugacities of oxygen and hydrogen gases are unity, the equilibrium electrode potentials for the above reactions at 25 °C are ... 

N (g), we obtain A H = -153.69 0.75 kcal mol" at unit fugacities of oxygen and nitrogen. When this value is combined... 

K is the temperature at which the fugacity of oxygen is one atmosphere for the decomposition reaction Na Od)... 

The measured heat of combustion was (12.034 0.005) kJ-g the error given is 1 cj. This value was then corrected for the impurities in the sample and the percentage of combustion. The latter value of (12.036 0.008) kJ-g was subsequently converted to constant pressure at 298.15 K, corrected to standard fugacity of oxygen and led to a heat of formation of - (1100.6 1.3) kJ-mof where the uncertainty has been increased to the 95% level. This value is accepted by this review. 

The composition of average European Shale The activity (or fugacity) of oxygen Billion (10 ) years High Field Strength trace element FGgh p. mantle source region (see Island-Arc Tholeiite... 

The fugacity of oxygen at the cathode is usually well determined as the cathode is typically exposed to air. For the anode side of the cell, the fugacity will be set by the reaction equilibria between the fuel and oxidation products. This is well defined for H2 fuel as only one reaction can occur ... 

Fig. 7. Log molar concentration of total propionate (propionate + propionic acid) versus total acetate (acetate + acetic acid) (N = 82) for samples from 90 to 110°C. Solid line is a least squares fit to the data. Dashed lines are contours of the log fugacity of oxygen from Shock (1989) and represent the calculated equilibrium between propionic and acetic acids at 100 °C and 300 bar. For data sources, see Fig. 6...

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