Consider a generic two-bodies-to-two-bodies reaction:
As the reaction proceeds the products of this reaction (C and D) become sufficiently dense in number that they will begin to react and form A and B through the reverse reaction:
When eventually the rate of the forward reaction (8.50) is the same as the rate of the reverse reaction (8.51), the system is in chemical equilibrium. We can combine (8.50) and (8.51) and write
If we were trying to find the rate for which the reaction (8.52) proceeds from the point of view of the individual gas molecules, we would say the rate of increase of the concentration of C is given by d[C] = kab [A][B] - kcd [C][D] dt d
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