At 298K the standard free energy of formation of H2O(l) is –237.20 kJ/mole while that of its ionisation into H+ ion and hydroxyl ions is 80 kJ/mole, then the emf of the following cell at 298 K will be (in V).
(Take F = 96500 C)
H2 (g, 1 bar) | H+ (1M)| |OH- (1M) | O2 (g, 1 bar)
(Response should be upto only two decimal digit like 78.70 or 0.08).
0.4
0.81
1.23
-0.4
Cell reaction
Cathode:
Anode :
________________________________________________________________
Also we have
Hence for cell reaction
so,