Question

For a specification of not more than $1$mol of the light key in the bottom product and

not more than $1$mol of the heavy key in the top product, and a reflux ratio of $2\mathrm{.}5,$

make

a stage$-$by$-$stage calculation to determine the product composition for only $3$ stages

$P=8\mathrm{.}3$ bar

Bottom to top calculation: