When the Cu2+ concentration is 7.27x104 M, the observed cell potential at 298K for an electrochemical cell with the following reaction is 0.984V. What is the Cr3+ concentration? 3Cu2+(aq) + 2Cr(s) 3Cu(s) + 2Cr3+(aq) Answer: 10x10^6 M When the Hg2+ concentration is 6.15x10 M, the observed cell potential at 298K for an electrochemical cell with the following reaction is 1.499V. What is the Cr3+ concentration? 3Hg2+(aq) + 2Cr(s)—3Hg(1) + 2Cr3+(aq) Answer: I M