March 1, 2017

Homework Help: Chemistry

Posted by Sophie on Monday, May 5, 2014 at 3:39am.

Consider a fuel cell that uses the reaction of ethanol with oxygen to produce electricity,
CH3CH20H(l)+ 3O2(g)---> 2CO2(g)+3H2O

Use thermodynamic data to determine the value of E°cell for this cell at 25 °C.

I don't really know where to start. I got the standard G for
CH3CH2OH: -174.8 kJ/mol
O2: 0 kJ/mol
CO2: -394.4 kJ/mol
H2O: -237.1

I was thinking maybe I should use deltaG = deltaG(products)- deltaG(reactants).

Then use the equation of of deltaG = -nFEcell and manipulate it to Ecell=deltaG/-nF, but then I don't know how many n is transferred.
Can someone please help me with the problem? I don't really understand how to do it.

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