Reaction 1:V2+(aq)+2e−→V(s)E°=−1.18V Reaction 2:Pb2+(aq)+2e−→Pb(s)E°=−0.13V
Net Reaction:V(s)+Pb2+(aq)→Pb(s)+V2+(aq )

The vanadium-lead galvanic cell in the diagram above initially operates under standard conditions according to the net reaction shown in the table below the diagram. The cell operates for 1.0 minute at a constant known current. Which of the following mathematical relationships would be most useful for determining the change in mass of the V(s) electrode after 1.0 minute of the cell's operation without having to use a balance?

A.) Ecell=E°cell−(RT/nF)lnQ.
B.) I=q/t
C.) ΔG°=−nFE°
D.) ΔG°=ΔH°−TΔS°