A gas sample drawn for a stack has the following information: A 1.2 m3 (dry volume) of sample was drawn in 30 minutes. By cooling the original stack gas, they collected about 40 grams of water for the dry volume of 1.2 m3 of sample. Determine the SO2 concentration in the gas stream leaving the stack gas, in ppm. The dry sample gas (MW=30) contains 300 ppm of SO2 measured at 20C and 1 atm. Molecular weight of SO2 is 64.