The partial analysis of a fuel gas sample by the modified orsat method showed the presence of 0.2% h2s, 2.2% co2, and 5.4% illuminants. the so3 evolved in the illuminant determination was 0.4%.the final reading of the measuring burette after the absorption of o2 was 9.1 cubic centimeters .what was the percentage of oxygen in the sample? a) 0.7% ,b) 0.9% ,c) 1.1% ,d) 1.3%