# K_a (Chemical Equilibrium Constant )

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K_a =
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DavidC.K_a (Chemical Equilibrium Constant )
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The Chemical Equilibrium Constant represented by K_a can be expressed therefore in terms of system Pressure and the mole fraction of component i in the gas.   For reaction aA + bB harr 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:
hatf_i = y_iP = p_i    where:
hatf_i = fugacity of component i  ,
y_i = mole fraction of component i in the gas, and
P = system Pressure