1. A mix of Natural Gas with the following volumetric flow analysis (93.6% Methane (CH) and 4.2% Ethane (C2He) and 2.2% Propane (C3H8) at 25C, 1 atm. It enters the boiler at a rate of 2 kg/s and burns completely with the air coming from an air preheater system operating at steady state. If the fuel mixture is burned with 190% of theoretical air determine (55 points) a. The temperature and mass of the air going into the boiler. b. The heat transfer of the boiler to the surroundings if we estimate it as 2% of the total heat release of the process. Natural Gas 25C, 1 atm T = ? Air 25C, 1 atm Preheater Boiler Combustion gas at 655C 800C Feedwater Steam