1) Calculate the standard electrode potential difference (E°) of the Daniell cel
ID: 479053 • Letter: 1
Question
1) Calculate the standard electrode potential difference (E°) of the Daniell cell (at 25 °C) if pressure is 500 MPa.
a) 1.099 b) 1.102 V c) 1.080 V correct answer 1.099
2) Using CRC Handbook, calculate the standard electrode potential difference (E°) of a fuel cell, which consumes hydrogen and oxygen and produces gaseous water at 1000 K and 1 bar
a) 1.229 V, b) .998V , c) 1.167 V correct answer .998
3) Using CRC Handbook, calculate the standard electrode potential of the O2 gas electrode at 1.014 bar and 100 oC.
a) 1.229 b) .998 c) 1.667
correct answer 1.167
Please show the work
Explanation / Answer
1) the standard electrode potential difference (E°) of the Daniell cell (at 25 °C) if pressure is 500 MPa wil be same as at atomsperic pressure because E0 does not depend on pressure.
E0 = Ered (Cu2+IICu) - Ered(Zn2+IIZn)
where
Ered (Cu2+IICu) = + 0.339 V
and
Ered(Zn2+IIZn) = - 0.760 V
therefore
E0 = + 0.339 V - ( 0.760 V )
= + 0.339 V + 0.760 V
= 1.099 V
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