How many grams of mg2n2 can be produced from 50 grams of mg

If it is Mg2N2, and the limiting element is Mg, then the mass of Mg2N2 that can be produced is 50g/2 = 25 grams.
if it is Mg3N2, then the mass is 50/3 = 16.67grams.

Ametal with a large number of free flowing electrons most likely has good conductivity

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.