Where do you get ΔG° from? My bet is that in this particular problem the value OP gave was calculated from E°.
That's fine. I was just pointing out that the OP's attempt to calculate K
c then does not require E° once we've got ΔG° as the OP has - we don't need nFE=RTlog
e(K
c), as we've already got -nFE in the form of ΔG° summed up.
Actually I have ignored ΔG° given and calculated K directly from E° - and I got a result below 10100 (not that K over 10100 is unreasonable! Try to estimate K for oxidation of sodium by elemental chlorine).
I have no idea how to estimate K
c from a reaction but I agree you could get values well over 10
100, but these would generally not be considered reversible reactions at all. But ok, I take your point.
The OP's calculation of ΔG° may be faulty then? I get a value of 3.5·10
103 moldm
-3 with the numbers I wrote in my above post.
Not to mention the fact that if someone is unable to calculate 10x just because x is too large for their calculator, it means they have no idea what they are doing.
Some people may not have learnt change of base in their maths class yet? :p In any case we (at least I) can work out the number pretty easily, it just seems slightly unreasonable for this reaction.