Isothermic processes fugacity

In this method the chemical equilibrium state is defined by the chemical equilibrium constant [10]. The chemical equilibrium constants can be derived from (6.48) provided that appropriate expressions are introduced for the chemical potential. A change in chemical potential for an isothermal process is related to a change in the fugacity of the species [13] ... 

The pure species A and B are isothermally compressed (or expanded, depen on the pressure P) to their equilibrium fugacities in the box. The change in Gibbs energy for this process is given by Eq. (15.9), here written for one mole... 

In a sorption process, a species from a fluid phase binds to the surface of (in the case of adsorption) or in the interior of (for absorption) another condensed phase. Thus, one can find sorption of gas molecules to liquids, adsorption of gas molecules to the surface of liquids or solids, or sorption of solute species (ions or molecules) from solution to solid particles. An adsorption isotherm or, more generally, a sorption isotherm, is an equilibrium relationship between the activity (or fugacity) of the species to be bound, the sorbate, in the bulk phase and the activity of the bound sorbate. The process can be regarded formally as a chemical reaction, for example, in the case of adsorption from aqueous solution... 

The fugacity is a useful function in the study of phase and reaction equilibrium, as will be shown in later chapters. It may also be used in the computation of the work of expansion or compression of a gas in a flow process. As discussed in 2 4, the maximum shaft work which may be obtainedf during the steady isothermal flow of a gas is equal to the decrease of its Gibbs function ... 

The pressure at which the pure liquid and gas phases of H2O are in equilibrium at 298.15 K (the saturation vapor pressure of water) is 0.03169 bar. Use Eq. 7.8.18 on page 185 to estimate the fugacity of H20(g) in equilibrium with pure liquid water at this temperature and pressure. The effect of pressure on fugacity in a one-component liquid-gas system is discussed in Sec. 12.8.1 use Eq. 12.8.3 on page 400 to find the fugacity of H2O in gas phases equilibrated with liquid water at the pressures of states 1 and 2 of the isothermal bomb process. (The mole fraction of O2 dissolved in the liquid water is so small that you can ignore its effect on the chemical potential of the water.)... 

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