n-Octane (C8H18) is burned in the constant pressure combustor of an aircraft engine with 70 percent excess

Question:

n-Octane (C8H18) is burned in the constant pressure combustor of an aircraft engine with 70 percent excess air. Air enters this combustor at 600 kPa and 327oC, liquid fuel is injected at 25oC, and the products of combustion leave at 600 kPa and 1067oC. Determine the entropy generation and exergy destruction per unit mass of fuel during this combustion process. Take T0 = 25oC.