A mixture of $38$ mol$-\%$ methanol, $24$ mol$-\%$ ethanol, $26$ mol$-\%$

n$-$propanol and $12$ mol$-\%$ n$-$ butanol is subjected to flash

distillation at $760$ mmHg total pressure. The feed flow rate is $170$

kmol$/$h$.35\%$ of the feed is vaporized and the rest leaves the vessel

as liquid product. Calculate the temperature, compositions and flow

rates of the vapor and liquid products.$($Use of Excel is

highly recommended.$)$