An analysis of waste solvent vapors from one plant showed that the gas contained 20mol% CH4, 20mol% CS2, 30mol% SO2, and 30mol% H2O. The gas is fully combusted with air and then emitted. The regulations limit the SO2 concentration in the emitted gases to no more than 2mol% on a dry basis.
a) Use a degree-of-freedom analysis based on extents of reaction to determine how many process variables must be specified for the remaining variable values to be calculated.
b) what is the composition of the emitted gases? Assuming air contains 21mol% oxygen and 79mol% nitrogen.