Please show your working and do not use AI$/$Chat gpt or the solutions will be down voted, thank you. An effluent gas from a refinery with composition $C{H}_4,C_2{H}_6,C_3{H}_8$ and $C_4{H}_{10}$ is fed into

an absorber to reduce the propane content of the effluent before recycling. The

absorber operated at $37C$ and $400$ kPa $($abs$).$ The entering oil and gas with its

composition is shown in the following table. The absorber has $4$ theoretical stages.

Table $1$: The entering oil and gas with its composition