In a certain area of ​​the apparatus, where the pressure is 1 atm and the temperature is 200 ° C, the analysis of the gas is 33.33% NH 3 (A), 16.67% N 2 (B), and 50% H 2 (C) by volume. The conditions are such that the
ammonia diffuses from the gas stream to the catalyst surface; also the
products of the reaction diffuse in the opposite direction, as if there were molecular diffusion to
through a 1 mm thick gaseous film under a laminar regime.
Report the following:
a) N A, z:

Answerthe half-reaction having the greatest tendency to occur at the anode:     i₂(aq) + 2e⁻  ⇄ 2i⁻  ;   e = +0.53 v======oxidation occurs at the anode. we must therefore find the half-reaction with the greatest tendency to oxidize.the given values of e are reduction potentials (the form of the half-reactions are of reduction).the lower the reduction potential, the higher the potential to oxidize. the half-cell with the lowest reduction potential will have the greatest tendency to oxidize at the anode.the half-reaction having the greatest tendency must be    i₂(aq) + 2e⁻  ⇄ 2i⁻    e = +0.53 vbecause its reduction potential is the lowest out of the three.