Split_00042 - 8.65(contd(b T = 75 C pC6 H 6 = 648 mm Hg pC7...

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8- 42 8.65 (cont’d) (b) T p = ° = 75 648 C mm Hg C H 6 6 , p C H 7 8 mm Hg = 244 (from Table 6.1-1) Raoult's law = + = + p x p x p tank C H C H C H C H 6 6 6 6 7 8 7 8 0 439 648 0561 244 . . b gb g b gb g = + = 284 137 b g mm Hg = 421 mmHg P 0.554 atm tank y v C H 6 6 6 6 284 mm Hg 421 mm Hg mol C H mol = = 0 675 . b g 0.541 C H ( ) n v l 6 93.19 mol/s 6 0.459 C H ( ) l 7 8 90°C, P 0 atm (mol/s), 75°C 0.675 C H ( ) v 6 6 0.325 C H ( ) v 7 8 n L (mol/s), 75°C 0.439 C 6 H 6 ( l ) 0.541 C 7 H 8 ( l ) 0.554 atm Mole balance: = C H balance: 0.541 40.27 mol vapor s 52.92 mol liquid s 6 6 9319 9319 0 675 0 439 . . . . n n n n n n v L v L v L + = + U V W = = b gb g (c) Reference states : C H , C H at 75 C 6 6 6 6 l l b g b g ° Substance C H in mol s C H in kJ mol C H C H in in out out 6 6 6 6 7 8 7 8 ± ² ± ² . . ± . . . ² . . . . . n H n H v n l H v l b g b g b g b g 2718 310 50 41 216 2323 0 1309 353 42 78 2 64 29 69 0 C H , 90 C kJ mol 6 6 l H ° = = b g b gb g : ² . . 0144 90 75 216 C H , 90 C kJ mol 7 8 l H ° = = b g b gb g : ² . . 0176 90 75 2 64 C H , 75 C kJ mol 6 6 C v H T dT H v ° = + + + × = A ° z b g b gb g b g : ² . . . . . . ² . 0144 801 75 30 77 0 074 0 330 10 310 80 1 3 80.1 75 Δ C H , 75 C kJ mol 7 8 v H T dT ° = + + + × = z b g b gb g : ² . . . . . . 0176 110 6 75 3347 0 0942 0 380 10 353 3
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