A particular coal has the following mass analysis: inert ash, 10 percent; nitrogen, 2 percent; oxygen, 12 percent; sulfur 1 percent; hydrogen 5 percent; and, carbon, 70 percent. For complete combustion with 120 percent theoretical air, find (a) the mass of air needed per kilogram of coal (b) the percent of the gas volume occupied by each of the dry products of combustion (that is, the non-water volumes will sum to 100 percent) and (c) the dew point of the products of combustion.