An engine uses methanol (CH3OH) as a fuel with 300% excess air. Air enters the engine at 1 bar and 25 C, and is mixed with fuel at 25 C before combustion. Product gases leave the CC at 75 C. Calculate: - (a) the molar composition of product gases, (b) the chemical exergy of the product gases, and (c)the exergy destruction and exergy efficiency for the CC(combustion chamber)