The product gas from a solid fuel combustion reaction has the following dry-basis molar composition: 72.0% CO2, 2.57% CO, .0592% SO2, and 25.4% O2. Pre oxygen is fed to the furnace in 20% excess of that required to burn the fuel completely. There is no oxygen in the fuel. Calculate the elemental composition (mole% of the various elements) of the fuel, stating any assumptions you have to make to arrive at your answer.