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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  Ecell for the pentane-oxygen fuel cell is

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 
Ecell for the pentane-oxygen fuel cell is

Grade:12

1 Answers

Neeti
571 Points
5 years ago
The Standard free energies of formation are basically Go .
Now you have Go for the formation of H2O, CO2 and Pentane.
H2 + 1/2O2 = H2O …. Go is -237.2
Similarly for the formation of CO2 and pentane , Go are givem
 
Now combustion of pentane is (pentane oxygen fuel cell)
 
pentane + O2 = CO2 + H2O .
Balance the equation. this becomes the target equation. Using the equations for the formation of pentane, CO2 and H2O, write Go of this target equation in terms of Go of CO2 , H2O and Pentane.
 
Now we have Go for the pentane oxygen fuel cell, use this Go to calculate Eo using formula
Go = -nFE
 
tTry this and you’ll get the answer :)
Please feel free to ask any follow up question and approve the answer if you think it’s useful :) (the option is given just below this answer ) 

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