Need to Find OCV for H2O2 Fuel Cell

[Kuriger9]

Homework Statement

Calculate the open cell voltage for an H2/O2 fuel cell operating at P=1atm and T = 100°C

Homework Equations

Nernst Eq: E^o+(RT/nF)*ln[(a_H2)*(a_O2^1/2)/(a_H2O)]

The Attempt at a Solution

E=1.17V+((8.314J/mol-K)*(373K))/((2e^-)*(96486C/e^-))*ln[(P_H2*P_O2^1/2)/P_H2O]



I'm not sure what the partial pressures should be such as: P_H2, P_O2^1/2, and P_H2O.

Any help would be MUCH appreciated. Thanks

 

[Borek]

Chances are I need a coffee and I am missing something obvious. If so, there are already two of us.

Activity of water is just 1. But unless there is some convention in describing fuel cells that I have no idea about, I don't see what "operating at P=1atm" is intended to mean. Perhaps it is hydrogen at 1 atm and atmospheric oxygen (so at 0.21 atm?). But if so, wording is ambiguous.