To produce sulfuric acid using the lead chamber process, SO2 is produced by burning sulfur. Sulfur (100 kg/h) with 10% inert slag are fed to the furnace. The sulfur is fed at 25C. Humid air—100% excess with respect to the stoichiometric one—is fed at 25C and 700 mmHg.

The gases leaving the furnace have a dew point of 12.5C and are at 450C; the slag is collected at 400C (cp50.16 kcal/kg). Determine the composition of the gases if all the sulfur is burned to SO2, the air moisture, and the heat loss of the burner.