An equimolar mixture of iso$-$pentane and benzene is to be separated using an enriching column to obtain a top product having $97$mol$\%$ iso$-$pentane. The feed rate is $100$kmo$\frac{l}{h}r$ saturated vapor. If the reflux ratio is $3$ times the minimum, determine $($a$)$ the concentration of the bottoms product $($b$)$ the amounts of the distillate and bottoms produced $($c$)$ the number of theoretical stages needed. $(15$PTS$)$ EQUILIBRIUM DATA BELOW IS IN TERMS OF ISO$-$PENTANE

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