How can we find the average molecular weight of a gas mixture? 13 Kg charcoal (carbon) was required to burn in presence of 3.5 times of air than the required amount from calculation. According to mole basis it was found that, 57% charcoal was converted to carbon dioxide (CO2) and 23% was converted to Carbon monoxide (CO). Find the remaining charcoal amount and average molecular weight of the outlet gas stream. [Ref: 16O, 14N, 12C]?