Given the information below, what is the value of the unknown equilibrium constant?
Reaction 1 2 NOCl(g) <====> 2 NO(g) + Cl2(g) Keq = 4.7 x 10-4
Reaction 2 N2(g) + O2(g) <====> 2 NO(g) Keq = 5 x 10-31
Reaction 3 N2(g) + O2(g) + Cl2(g) <===> 2 NOCl(g) Keq = ?