Pseudo-steady state mode with a rate-determining step

Pseudo-steady state mode with a rate-determining step 

Examine a pseudo-steady state mode with a rate-determining step i. (the mechanism is assumed to be linear). We know that all the other steps p i) are practically at equilibrium and Gibbs energy of each one of them is nnll  

Therefore, if is the mnltiplying coefficient relating to step p, the Gibbs energy of the total reaction will be  

It is known that in this case the rate of the reaetion is given aecording to the reaetivity and the spaee funetion of the rate-determining step is given by  

This expression involves the distance to equilibrium of step i we can write AG 

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Unless otherwise stated, and in particular section 15.2.5 devoted to mixed modes, we will be using the approximation of the pseudo-steady state modes with a rate determining step. Except in certain cases of abnormal diffusions, the rate will be separable and we will be able to devote ourselves to the study of the reactivity, the space functions, of very simple structures in the case of plates, having been determined in Chapter 10. 

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