Gaseous propane (C3H8) is fed at 1.5 kg/min to burn with air. The air supplied has its amount 1.75 times of its theoretical air. The exhaust gas produced contains CO2, H2O, O2 and N2. a) Find the corresponding air-fuel ratio b) If burning 2 moles of propane, how many moles of O2 will be found in the exhaust gas? c) Under the standard conditions, find the heat release rate per one kmol of C3H8 in the unit of kJ/min