Figure 7.37 is an enthalpy-concentration diagram for n-hexane (H), and n-octane (O) at 101 kPa. Use this diagram to determine the: 

(a) Mole-fraction composition of the vapor when a liquid containing 30 mol% H is heated from Point A to the bubble-point temperature at Point B; 

(b) Energy required to vaporize 60 mol% of a mixture initially at 100F and containing 20 mol% H (Point G); and
(c) compositions of the equilibrium vapor and liquid resulting from part (b).

Transcribed Image Text:

Enthalpy, Btu/lbmol x 103 30 20 10 IH --- G P= 1 atm 0.2 240 °F B A 220 °F 200°F 300°F 280 °F 260 °F Saturated vapor Saturated liquid 180 °F 140 °F 120 °F 100 °F 0.4 0.6 Mole fraction of n-hexane, x or y 0.8 ·•. Figure 7.37 Enthalpy-concentration diagram for n-hexane/ n-octane. 160 °F V 1.0