Ethane is chlorinated in a continuous reactor: C₂H₆ + Cl₂ → C₂H₅Cl + HCl Some of the product monochloroethane is further chlorinated in an undesired side reaction: C₂H₅Cl +Cl₂ → C₂H₄Cl₂ + HCl

Take a basis of 100 mol of C₂H₅Cl produced. Assume that the feed contains only ethane and chlorine and that all of the chlorine is consumed. How many degrees of freedom remain (use atomic balances)?