Chemical Equilibrium Constant Calculation

[hotwheelharry]

Homework Statement

If Q = 1.0 1042 for the reaction C(s) + O2(g) → CO2(g) at 25°C, calculate Keq.

dG^o_f (Kj/mol) of...
C(s)=0
O2(g)=0
CO2(g)=-394.36

Homework Equations

dG^o_rxn = -R*T*ln(K)

The Attempt at a Solution

-394.36*1000 = -8.314472(298)ln(K)
K=1.3e69

This is the wrong answer. I'm lost as to what to do. Please help.
I might be using the wrong equation for the situation. The only information I was given was in the problem statement.

 

[Borek]

What is Q? How is it related to Keq?