Problem 6.4.7 i-Pentane / n-Pentane Mixture Suggestion: identify what calculations can be done manually, use a spreadsheet if you need it, or use a solver to be provided to the class in the announcements. A closed system contains 42.0 mol% n-pentane and the remainder i-pentane. Hint: At the first vapor formation, one has a bubble-point condition; at the last liquid, one has a dew- point condition. Constant Temperature Evaporation Suppose the system is initially all liquid at 135 C and at a high pressure. The pressure is then gradually reduced at constant temperature. Estimate the pressures at which the first bubble of vapor forms and at which the last drop of liquid evaporates. Also calculate the liquid and vapor compositions (mole fractions) at those two conditions. a. First Vapor Pressure at which first bubble of vapor forms: Liquid Species Phase X n-Pentane i-Pentane mm Hg Vapor y