Using the enthalpy'concentration diagram of Figure, determine the following for a mixture of n-hexane (H) and n-octane (0) at I atm:

(a) The temperature and compositions of equilibrium liquid and vapor resulting from adiabatic mixing of 950 lb/h of a mixture of 30 mol% H in O at l8oF with 1,125 Ib/h of a mixture of 80 mol% H in O at 24oF.

(b) The energy required to partially condense, by cooling, a mixture of 60 mol% H in O from an initial temperature of 26oF to 200oF. What are the compositions and amounts of the resulting vapor and liquid phases per pound-mole of original mixture?

(c) If the equilibrium vapor from part (b) is further cooled to 180oF, determine the compositions and relative amounts of the resulting vapor andliquid.

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300 °F 280 °F 260 °F 30 Saturated vapor 20 Saturated liquid 10 140 °F 120 °F 100 °F G A P = 1 atm 1.0 0.8 0.6 0.4 0.2 Mole fraction of n-hexane, x or y Figure 7.37 Enthalpy-concentration diagram for n-hexane/ n-octane. Enthalpy, Btu/lbmol x 10-3 240 °F 220 °F B. 200 °F do 081 do 091