The ultimate analysis of a coal sample is given below. Carbon = 61.5%, hydrogen = 3.5%,
Sulphur = 0.4%, Ash = 14.2%, Nitrogen = 1.8% and rest oxygen. Calculate the theoretical
oxygen required per unit weight of coal, theoretical air required per unit weight of coal and the
Orsat analysis of flue gases if the coal is burnt with 90% excess air.