Question

Which are spontaneous? How do you know?

Given: Ag+(aq) + e- → Ag(s) E° = +0.799 V AgI(s) + e- → Ag(s) + I-(aq) E° = -0.152 V Ni2+(aq) + 2 e- → Ni(s) E° = -0.267 V Which of the following reactions should be spontaneous under standard conditions?

I. 2 AgI(s) + Ni(s) → 2 Ag(s) + 2 I-(aq) + Ni2+(aq) II. Ag+(aq) + I-(aq) → AgI(s)