P7.42 Trace organic contaminants in waste water readily

adsorb onto a solid called activated carbon, which is

not very different from charcoal briquets. Equilibrium

data for adsorption of phenol onto activated carbon is

shown. One liter of wastewater containing 1 g phenol

is contacted with 5 g activated carbon at 20°C. At

equilibrium, what fraction of the phenol is adsorbed?