I need new solve step by step. please fast as u can.

A solvent-recovery plant consists of absorber and stripper plate columns. Ninety percent of the benzene (B) in the inlet gas stream, which contains 0.06molB/molB-free gas, is recovered in the absorber. The oil entering the top of the absorber contains 0.01molB/mol pure oil. In the leaving liquid, X=0.19molB/mol pure oil. Operating temperature is 77F(25C). Superheated steam is used to strip benzene from the benzene rich oil at 110C. Concentrations of benzene in the oil =0.19 and 0.01, in mole ratios, at inlet and outlet, respectively. Oil (pure)-to steam (benzene-free) flow rate ratio =2.0. Vapors are condensed, separated, and removed. Additional data are: MW oil =200,MW benzene =78, and MW gas =32. Benzene equilibrium data are: Calculate the: (a) molar ratio of B-free oil to B-free gas in the absorber; (b) theoretical plates for the absorber; and (c) minimum steam flow rate required to remove the benzene from 1mol of oil under given terminal conditions, assuming an infinite-plates column