Please draw the graph of Langmuir isotherm and explain why qmax$=269\mathrm{.}78$ mg$/$g and Kl$=0\mathrm{.}395$ L$/$mg$?$

Explain why the minimum dose of activated carbon needed to achieve a toluene concentration from $20$mg$/$L to $0\mathrm{.}1$ mg$/$L$?$