The standard cell potential ecell of the zinc-air battery, Ask an Expert

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The standard cell potential (Ecell) of the zinc-air battery is 1.65V. If at 25 degrees celcius the partial pressure of oxygen in the iar diffusing through its cathode is 0.22atm, what is the cell potential (Ecell)? Assume the cell reaction is:

2Zn(s)+O2(g)---->2ZnO(s)

The standard reduction potentials of the half reactions in zinc air batteries are:

ZnO(s)+H2O(l)+2e- ---->Zn(s)+2OH-(aq) Ered=-1.25V
O2(g)+2H2O(l)+4e- ---->4OH-(aq) Ered=0.401V

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