Horiuti formula

Consider another limiting case, a reaction following a number of parallel routes each involving only one slow step. If we could measure the current corresponding to one of the routes, we would be able to determine, with the aid of the Horiuti formula, the true stoichiometric number of the slow step of this route (since there is only one slow step, the true Pp is determined)... 

This formula for determining the stoichiometric number of the rate-limiting step was for the first time derived by Horiuti, who introduced the concept of the stoichiometric number into kinetics and showed its significance. 

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