Dry pyrites fines containing 82% FeS2 and 18% gangue are burned in a Herreshoff burner. The cinder produced contains 3.06% SO3 and no unburned FeS2. Orsat analysis of the burner gas showed 8.16% SO2,...

Dry pyrites fines containing 82% FeS2 and 18% gangue are burned in a Herreshoff
burner. The cinder produced contains 3.06% SO3 and no unburned FeS2. Orsat analysis
of the burner gas showed 8.16% SO2, 8.46% O2 and 83.38% N2. Calculate:
a. % of the FeS2 charged converted to SO2
b. % excess air (FeS2 → SO2
c. complete analysis of the burner gas