Methane is burned with theoretical oxygen in an SSSF process, and the products exit the combustion chamber

Question:

Methane is burned with theoretical oxygen in an SSSF process, and the products exit the combustion chamber at 5300 F, 100 lbf/in 2. Calculate the equilibrium composition at this state, assuming that only CO2, CO, H2O, H2, O2, and OH are present.
Combustion: CH4 + 2 O2 CO2 + 2 H2O