P7.43 10 L of water are contaminated with 200 mmol phe- nol. The water must be cleaned up to contain no more than 5 mmol phenol before it can be discharged.

This will be accomplished by pumping the solution into a vessel loaded with fresh activated carbon, waiting for the phases to equilibrate, then removing the liquid solution. How much activated carbon should be loaded into the vessel? Assume an operating tempera- ture of 20°C. Use the equilibrium data given with Prob. P7.42.