A mixture containing 50 g mol of benzene and 50 g mol of chlorobenzene is distilled by simple distillation without reflux until 40 percent of the initial charge is taken off as overhead. The system benzene-chlorobenzene may be considered ideal, with an average relative volatility of 5.3.

(a) What are the compositions of overhead and residue after distillation is complete?

(b) The overhead from the first distillation is subjected to a second simple distillation. Again 40 percent of the charge is taken overhead. What is the composition of the second overhead product? What is its mass in grams? How many grams of chlorine does it contain?