Step-by-step approach: (1) Write the balanced half-reactions and overall cell reaction. (2) Identify n (total electrons transferred). (3) For EMF: use $E_{cell}$ = $E_{cathode}$ - $E_{anode}$ (reduction potentials). (4) For non-standard conditions: apply Nernst, E = $E_{standard}$ - $\frac{0.0592}{n}$log(Q). Write Q correctly from the balanced equation. (5) For $delta_G$: use $delta_G$ = -nFE. (6) For electrolysis: m = $\frac{MIt}{nF}$. Convert minutes to seconds. (7) For conductivity: $Lambda_m$ = kappa*1000/C. For Kohlrausch: add/subtract Lambda_m_{infinity} of strong electrolytes. Common errors: wrong sign convention (always use reduction potentials), wrong n, confusing conductance with conductivity, and forgetting to balance the cell reaction before writing Q.