A mixture of benzene$-$nitrogen vapor is passed through an adsorption column,

containing a mass ratio of $0\mathrm{.}082$lb of benzene$/$lb of nitrogen countercurrent with

a flow of $10$ lb$/$min$,$ in contact with a moving stream of activated carbon to

remove $95\%$ of the benzene from the gas in a continuous process. Likewise, the incoming coal

contains $0\mathrm{.}052$ lb adsorbed benzene$/$lb activated carbon; while the temperature

and the pressure remain constant in the process at $33\mathrm{.}3$ oC and $1$ atm pressure,

respectively. Nitrogen is not adsorbed. Taking into account the diagram, determine,

in lb$/$min$,$ the incoming flow required to carry out benzene adsorption.

a$)1,876$ lb$/$min

b$)1,928$ lb$/$min

c$)1,973$ lb$/$min