EMF and standard electrode potential

1. Dec 8, 2008

Tonttu

1. The problem statement, all variables and given/known data
This question is my translation but there should be all info needed.

First part:
Calculate the emf and standard electrode potential of the cell Zn/ZnO/KOH(aq)/Ag2O/Ag

ZnO(s)+H2O(l)+2e- =>Zn(s)+2OH-(aq) E=-1,26V
Ag2O(s)+H2O(l)+2e- =>2Ag(s)+OH-(aq) E=0,342V

Second part(same cell as above)
T(K): 273K; 291K; 298K; 303K; 309K
E(V): 1,6160V; 1,6143V; 1,6137V; 1,6132V; 1,6126V

Calculate emf and change in gibbs energy in temperature 298K.

2. Relevant equations
Nerst equation: E=Eo-((RT)/(ZF))*ln K

3. The attempt at a solution

First part:
Zn+Ag2I=>ZnO+2Ag E=1,602V
I don't know if emf and Standard electrode potential is same thing here. If so then why?

Second part:
I don't know if i should use Nerst equation here but how when i don't know K or concentrations yet?
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution