Partial pressure equilibrium constant

Observe that by setting = 0, the term KsKq/Kq) is simply the overall partial pressure equilibrium constant, Kp, for the reaction... 

For reactions involving gases, the equilibrium constant can be written in terms of partial pressures. The concentration equilibrium constant and the partial pressure equilibrium constant do not have the same value, but they are related by the equation ... 

The partial pressure equilibrium constant for the decomposition of CaCO, is K. If Beaker II is removed, under which of the following conditions would equilibrium NOT be achieved ... 

TABLE 9.6 Partial Pressure Equilibrium Constants for the Oxidation of Sulfur Dioxide ... 

Wan] Confrolled oxygen partial pressure Equilibrium constant at 1600°C... 

Similarly from Appendix C, Equation (C-9). if we know the partial pressure equilibrium constant at a temperature, 7, and the heat of reaction, we can find the equilibrium constant at any other temperature... 

Kp Partial pressure equilibrium constant k Specific reaction rate (constant)... 

Kp, the partial pressure equilibrium constant, is the relationship that exists among the partial pressures of gaseous reactants and products in a reversible reaction at equilibrium. Partial pressures are expressed in bar (after 1982) or atm (before 1982). 

At equilibrium, appreciable amounts of both gases are present From that point on, the amounts of both N02 and N204 and their partial pressures remain constant, so long as the volume of the container and the temperature remain unchanged. 

In the open system, water is in contact with an unlimited amount of a gas that is, the partial pressure is constant and is not changed by the quantity of the gas that is absorbed in the water phase (cf. Figure 4.2c). This system represents an appropriate model for equilibrium of a surface water with the atmosphere or for rainwater in contact with large quantities of air. 

The adsorption behavior of a surface is generally characterized by an adsorption isotherm, that is, the functional dependence of the amount of gas adsorbed on the gas partial pressure at constant temperature. The frequently used Langmuir isotherm describes the equilibrium adsorption for the formation of a monolayer it is based on the following assumptions ... 

Row I Partial pressures at constant temperature for light and heavy components Row II Total pressure at constant temperature Row III Equilibrium curve... 

None of the above equilibrium reactions will lead to complete conversion rather, the actual conversion rate and gas composition will be determined by a state of equilibrium that is more or less close to the theoretical one. This state can be determined by applying Guldberg and Waage s law [1.4]. As over the temperature range which is relevant for coal gasification the carbon occurs only in solid form and its partial pressure is constant, it may be neglected in the application of this law. Hence, only the partial pressures of the gaseous... 

Where P-, (atm) is the partial pressure of species i. The reaction is to be carried out isoihermaliy at 400°C. At this temperature the rate constant t, the adsorption constants for Oj (/fo,) 2nd SO (/fjOj) pressure equilibrium constant. Kf, were... 

Other conventions for treating equiUbrium exist and, in fact, a rigorous thermodynamic treatment differs in important ways. Eor reactions in the gas phase, partial pressures of components are related to molar concentrations, and an equilibrium constant i, expressed directiy in terms of pressures, is convenient. If the ideal gas law appHes, the partial pressure is related to the molar concentration by a factor of RT, the gas constant times temperature, raised to the power of the reaction coefficients. 

In the first step, in which the molecules of the fluid come in contact with the adsorbent, an equihbrium is established between the adsorbed fluid and the fluid remaining in the fluid phase. Figures 25-7 through 25-9 show several experimental equihbrium adsorption isotherms for a number of components adsorbed on various adsorbents. Consider Fig. 25-7, in which the concentration of adsorbed gas on the solid is plotted against the equilibrium partial pressure p of the vapor or gas at constant temperature. At 40° C, for example, pure propane vapor at a pressure of 550 mm Hg is in equilibrium with an adsorbate concentration at point P of 0.04 lb adsorbed propane per pound of silica gel. Increasing the pressure of the propane will cause... 

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