The percentage composition by mass of a sample of coal is C = 90, H= 3.5, O= 3.0, N = 1.0, S = 0.5, the remaining being ash. (A) The minimum mass of air required for the complete combustion of 1 kg of this fuel is 15.54 kg (B) The minimum mass of air requires for the complete combustion of 1 kg of fuel is 11.54 kg (C) The composition of dry products of combustion by volume, if 50% excess air is supplied is CO2: 10.65, N2: 84.33, O2 = 6.98, SO2: traces (D) The composition of dry products of combustion, by volume, if 50% air is supplied is CO2: 12.65, N2 80.33, O2 = 6.98, SO2: traces