Octane (C8H18) at 24oC and 100 kPa enters well insulated reactor and reacts at the same temperature

Question:

Octane (C8H18) at 24oC and 100 kPa enters well insulated reactor and reacts at the same temperature and pressure. For steady state operation and negligible effects of KE and PE, determine the temperature of the combustion products for the complete combustion with
(a) Theoretical amount of air and
(b) 300% theoretical air.