A vapor mixture containing 30 mol% benzene and 70 mol% toluene at 1 atm is cooled at constant pressure in a closed container from an initial temperature of 115 °C. Use Raoult's Law to answer the following questions:
l) At what temperature does the first drop of condensate form? What is its composition?
2) When the temperature is 100 °C, find the mole fraction of benzene in the vapor and liquid phases and the ratio of total moles in vapor to total moles in liquid.
3) At what temperature does the last bubble of vapor condense? What is its composition?