Town gas made from the gasification of coal used to be the gas supplied to homes around Britain until the exploitation of natural gas reserves took hold. The composition of a particular coal gas by volume percent is 4% carbon dioxide, 16% carbon monoxide, 50% hydrogen, 15% methane, 3% ethane, 2% benzene with the balance nitrogen.Write down the series of stoichiometric equations representing the complete combustion of each component and Calculate the air required when 100kmol of this coal gas is completely combusted in 20% excess air. (Assume the oxygen in air is 21% -balance is nitrogen). Also how many kmol of flue gases are produced and what is the percentage composition (CO2, N2 and water)?