Problem- A mixture of 0.500 mol NO2 and 0.500 mol CO is placed in a 1.00 L flask and given time to equilibrate. Analysis of the equilibrium mixture indicates that 0.123 mol of CO2 is present. Calculate Kc for the reaction.
NO2(g) + CO(g) = NO(g) + CO2(g)
Rework your solution from the beginning and check each step carefully.