The Chemical Equilibrium Constant represented by Ka can be expressed therefore in terms of system Pressure and the mole fraction of component i in the gas. For reaction aA+bB↔cC+dD, for mixtures of ideal gases, the partial pressure of component i is equal to the fugacity of component i. The relationship is expressed in the definition of partial pressure of the component i such that:
ˆfi = yiP = pi where:
ˆfi = fugacity of component i ,
yi = mole fraction of component i in the gas, and
P = system Pressure
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