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2.18 An activated carbon has an ultimate loading of 20 lbs of Toluene per 100 lbs of GAC and 5 pounds of isopropanol per 100 pounds of GAC. If exhausted air hits the GAC bed with 100 ppm of toluene and 100ppm of isopropanol, which will breakthrought first? a. There is not enough information stated in this problem b. It occurs simultaneously, because the concentration is equal for both compounds c. Toluene d. Isopropanol