1. A sample of a fuel gas contains 95% CH4 and 5% CO2 on a volume (= mol) basis. (a) (6 marks) Determine the amount of oxygen required for stoichiometric combustion of this fuel in kmol O2/kmol fuel. (b) (6 marks) The fuel is burned in air with 20% excess air. Calculate the quantities of products in kmol of each product per kmol of fuel. (c) (4 marks) Determine the dew point of the products from (b) part. The total pressure is 101 kPa. (d) (4 marks) The higher heating value of the fuel is 48.6 MJ/kg. Convert this to units of MJ/kmol fuel. (e) (8 marks) The fuel and air enter a furnace at 25C and the products leave at 400K. Determine the heat transfer per kmol of fuel and the efficiency of the furnace.