A textile finishing process involves drying a fabric that has been treated with a volatile solvent. The wet fabric entering the dryer contains 45% solvent, and the dried fabric contains 3% of the entering solvent. Solvent-free air enters the dryer at a rate of 8 pounds per pound of solvent-free fabric. The solvent has a molecular weight of 60 g mol-1. (a) Calculate the percentage of solvent in the dried fabric by weight. ( 2.4%) (b) Calculate the concentration of solvent in the dryer exhaust in mg m-3 if the exhaust is at 160 F and 1.0 atm.