An ideal solution of $5$mol of benzene and $3\mathrm{.}25$mol of toluene is placed in a piston and cylinder assembly. At $298$K$,$ the vapor pressure of the pure benzene is $96\mathrm{.}4$torr, the vapor pressure of the pure toluene is $28\mathrm{.}9$torr. Calculate the total pressure and the liquid composition and the vapor composition when $1\mathrm{.}5$mol of the solution has been converted to vapor.