Equilibrium Law Expression
Let us consider a reversible homogenous reaction.
According to the law of mass action, the rate of forward reaction ( rf)
is
rf = Kf
[ A ] [ B ]
and that of the backward reaction is
rb = Kb [ C ] [ D ]
Kb and Kf are the rate constants.
The rate of the net reaction is :
rn = rf - rb
At equilibrium, there is no net reaction i.e.
rf - rb = 0 \ rf
= rb
\ Kf [ A ] [ B ] = Kb [ C ] [ D ]
The equilibrium constant expressed in terms of partial pressures (Kp).
Equilibrium constants for gaseous reaction can be based on the partial
pressure of a gas as the partial pressure of a gas is directly proportional to
its molar concentration for a given temperature.
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