Midterm 2013 Q7

[Cowasjee_Sanaea_3E]

The question asks to calculate K for a redox reaction at 298 K.

And it says you can solve it two ways:
However when I try and solve it using
Delta G = -RTlnK
I keep getting 1.35x10^-72 (whereas the answer is 9.2x10^-72)

Known: When solving delta G= 4.1x10^5 J/mol.

Could someone please help me out? I don't know what I'm doing wrong? (I'm also using R=8.314 J/k•mol and T=298 K)

[Hannah_Chao_1D]

I did the same problem and got the same answer as you. I think there is an error in the course reader's answer.