Write the cell reaction and the equilibrium constant expression for, and determine the cell potentials at 25°C of the following electrochemical cells. (Use the lowest possible coefficients. Omit states-of-matter in your answer. Enter your answer using the format K = pHCl / pH2 . pCl2 to indicate partial pressures for gases or K = [H3O+] . [F-] / [HF] for aqueous chemicals.

Cr | Cr3+ (0.060 M) || Ag+ (0.68 M) | Ag