Use Basis: 100kg fuel oil, not mols

A furnace is fired with fuel oil containing 86%C,1%N, and 0.1%S with a calorific value of 46.4 MJ/kg. Air is supplied at 25C,740mmHg and saturated with water. Average analysis of the stack gas shows 10.62%CO2,1.17%CO,6.34%O2 and 81.87%N2. The stack gas leaves at 400C and 765mmHg. Calculate: a. \% excess air b. complete analysis of fuel oil c. m3 air/kg oil d. m3 stack gas/ kg oil