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1)

For hydrogen -oxygen fuel cell, the cell reaction is 

2H2(0)+O2(g)2H2O(l)

 if   G0f(H2O)=237.2kJmol1   , then emf of this cell is 


A) +2.46 V

B) -2.46 V

C) +1.23 V

D) -1.23 V

Answer:

Option C

Explanation:

 We know    G0= -nFE0

        E0=G0nF

 =+237.2×1000J2×96500=1.23V[n=2]