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 - (0.0592/n)log(Q). Write Q correctly from the balanced equation. (5) For delta_G: use delta_G = -nFE. (6) For electrolysis: m = 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.