# K_a (pressure, Ideal gas)

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K_a =
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DavidC.K_a (pressure, Ideal gas)
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The Chemical Equilibrium Constant represented by K_a can be expressed therefore in terms of pressures.   For reaction the general chemical reaction aA + bB harr cC + dD, which are mixtures of ideal gases the partial pressure of component is equal to the fugacity. This relationship is built upon 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