Q.

Standard free energies of formation (in kJ/mol) at 298 K are —237.2. —394.4 and —8.2 for H2O(l), CO2(g) and pentane(g), respectively. The value of Ecello for the pen­tane-oxygen fuel cell is

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a

2.0968 V

b

1.0968 V

c

0.0968 V

d

1.968 V

answer is B.

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Detailed Solution

C5H12+8O2→5CO2+6H2OΔGo=5×GCO2o+6×GH2Oo−GC5H12o−8×GO2o=5×(−394.4)+6×(−237.2)−8.2=−3403.4 kJΔGo=−nFEo−3403.4×103=−32×Eo×9650016O2−→32e−+8O2∴ Eo=1.1020 V; n=32
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Standard free energies of formation (in kJ/mol) at 298 K are —237.2. —394.4 and —8.2 for H2O(l), CO2(g) and pentane(g), respectively. The value of Ecello for the pen­tane-oxygen fuel cell is