Natural gas with a molar analysis of CH4 %86.5, C2H6 %8, C3H8 %2 and N2 %3,5 enters a reactor and burns completely with 50% excess air. Accordingly; a) Write the balanced reaction equation. b) Calculate the air-fuel ratio on a mass and molar basis. c) Determine the analysis of the combustion products on molar basis. d) Determine the dew point temperature of the combustion products, in oC, at 1 atm. e) Calculate the chemical exergy exiting with the combustion products (please note that the condensation of water in the flue gas).