What is the equilibrium constant for the redox reaction in question 3?

Question

Combining the two equations for ∆Go below ∆G= −n F Ecell and ∆G= −R T ln K
gives −n F E cell = −R T ln K...

The ecell from question three was .73V
The delta g from question three = −(6 mol) (96, 485C/mol)�(0.73 V) = −423 kJ

Is R in this equation 8.314 J/mol * K? And T wasn't specified, so I'm assuming it was 298 K. If these are the correct numbers, why doesn't moles from the constant R cancel? The correct answer is 2.8 × 10^30, but I cannot arrive at that answer. Please let me know if you need clarification.