Adsorption of benzene onto activated carbon has been reported to obey the following Freundlich isotherm equation, where c is in
mg/L and q is in mg/g:

qbens = 50.1 cben^0.533
A solution at 25°C containing 0.50 mg/L benzene is to be treated
in a batch process to reduce the concentration to less than
0.01 mg/L. The adsorbent is activated carbon with a specific
surface area of 650 m2/g.
Compute the required activated carbon dose.