In the industrial furnace industry, the ait fuel ratio is an important measure for anti pollution. You have asked for a stoichiometric mixture to see if there is enough air to completely burn of the fuel. These are required specifications: A sample of bituminous coal gave the following ultimate analysis by mass: 82.5% C, 5.1% H₂ , 5.8% O_{2, 2.8% N, 3.8% ash. Calculate the stoichiometric of air and fuel ratio.}