A synthesis of nitrogen dioxide from nitrogen and oxygen. There are 5.000 mol of N2 and 8.000 mol of O2 mixed in a 5.000-L flask. What is the equilibrium constant for the synthesis?
I think you need the amount of NO2 formed.
keq=[NO2]^2/[N2][O2]^2
N2 + 2O2 >> 2NO2