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Potential Voltage Difference In An Electrochemical Cell
The corrosion of iron can be thought of as an electrochemical cell reaction. Calculate the voltage difference between two points of corroding iron differing only in their partial pressure of oxygen: 0.20 atm of oxygen at one point and 0.0010 atm of oxygen at the other. The reaction is:

H2O +Fe (s) +1/2O2(g) ----> Fe(OH)2(s)

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