Determine the standard cell potential and the cell potential under the stated conditions for the electrochemical reactions described here. State whether each is spontaneous or nonspontaneous under each set of conditions at 298.15 K

(a) H gO) + Shaq, 0.10 Al) + 2Ag +(a. 0.25 M) 2Ag(s) + HgS(s)

(b) The galvanic cell made from a half-cell consisting of an aluminum electrode in 0.015 M aluminum nitrate solution and a half-cell consisting of a nickel electrode in 0.25 M nickel(11) nitrate solution.