Au**(aq) + 3e Au(s) A galvanic cell is composed of these two half-cells, with the standard reduction potentials shown: Co2+ (aq) + 2e - Co(s) -0.28 V Cr3+ (aq) + 3e - Cr(s) -0.74 V The actual concentrations in the cell are: (CO24) = 0.0100 M, (CP31= 0.00100 M. What is the potential of this galvanic cell? +0.54 V +0.40 V +0.52 V O +0.46 V Using the standard reduction potentials +1.42 V Ca2+ (aq) + 2e Ca(s) -2.76 V Calculate the value of Ecell for the cell reaction: 2Au(s) + 3Ca2+(aq) 2 Au3+ (aq) + 3 Ca(s) 0 +4.18 V O-1.34 V O-4.18 V O +1.34 V