Using the following standard reduction potentials, Sn3+(aq) + 2e- → Sn2+(aq) E° = +0.15 V Pb2+(aq) + 2e- → Pb(s) E° = -0.13 V calculate the standard cell potential for the galvanic cell reaction given below, and determine whether or not this reaction is spontaneous under standard conditions. Pb2+(aq) + 2 Sn2+(aq) → 2 Sn3+(aq) + Pb(s)