A vapor mixture containing 30 mole% benzene and 70 mole% toluene at 1 atm is cooled isobarically in a closed container from an initial temperature of 115 degree C. Use the T_xy diagram of Figure 6.4-1 to answer the following questions. At what temperature does the first drop of condensate form? What is its composition? At one point during the process, the system temperature is 100 degree C. Determine the mole fractions of benzene in the vapor and liquid phases and the ratio (total moles in vapor/total moles in liquid) at this point. At what temperature docs the last bubble of vapor condense? What is its composition?