pls solve for problem 3 referring to problem 2!!

Problem 2 The analysis of a fuel oil (SG = 0.84) is as follows: C = 83.9 H = 12.9 0 = 0.0 N = 1.0 S = 2.2 Calculate for combustion with 15% excess of dry air: a. Flue gas volume in cubic meters per liter of oil at 200C and 101 kPa. b. Orsat Flue Gas Analysis Problem 3 For the complete combustion of the fuel in Problem 2, estimate the excess air being used if the Orsat flue gas analysis shows 4% O2