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.