3. Ethanol is referred to as an oxygenated fuel because it contains oxygen and has the chemical formula C2H5OH (or equivalently C2H60). Ethanol is renewable and has different characteristics from non-oxygenated hydrocarbon fuels. Determine: (30 points) a) The fuel to air ratio for stoichiometric combustion of Ethanol in air (21 % O2 and 79% N2 by mole). b) The heat of combustion in kJ/kgfuel at 25 C. c) The molecular weight of the combustion products. Species hy (kJ/kmol) MW (kg/kmol) O2 0 32 N2 0 28 C2H5OH -277.7x103 46 CO2 -393.5x103 44 H2O -241.8x103 18