In an aniline production plant, reactor product stream containing nitrobenzene, aniline, water, and hydrogen is to be cooled in a heat exchanger to dew point temperature. The flow rate of the stream is $255$ kmo$\frac{l}{h}$ and the cooler operates at $1$atm. The composition of the species and Antoine constants are given in table. Obtain an expression to find dew point of mixture. DON'T SOLVE, JUST OBTAIN THE EQUATION.

$\backslash$table$[[$Components$,\backslash$table$[[$Mole$],[$fraction$]],$Antoine Constants,$],[A,B,C,],[$Nitrobenzene$,0\mathrm{.}020,7\mathrm{.}1156,1746\mathrm{.}59,201\mathrm{.}78,\backslash$table$[[T(C),],[P^{**}(mmHg)$