1. Estimate the standard free-energy change at the 25°C for the following reaction. Use standard electrode potentials.
4 Al(s) + 3 O2(g) +12 H+(aq)
4Al3+(aq) + 6 H2O(l)
2. Estimate the standard emf of the following cell at 25°C.
Sn(s) | Sn2+(aq) ||Cu2+(aq) | Cu(s)