Acetylene gas and x times theoretical air at room temper

Acetylene gas and x times theoretical air (x ??1) at room temperature and 500 kPa are burned at constant pressure in an adiabatic SSSF process. The flame temperature is 2600 K, and the combustion products are assumed to consist of N2, O2, CO2, H2O, CO, and NO. Determine the value of x.