Exam I Prob #4 Soln

Exam I Prob #4 Soln - 4) Ethanol (A) and water (B) are in...

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Unformatted text preview: 4) Ethanol (A) and water (B) are in solution and form a stagnant film with thickness L at a constant temperature on an organic solvent. Ethanol is soluble in the solvent, but water is insoluble. The film is in thermodynamic equilibrium at the film-solvent surface (2 = L). Neither ethanol nor water is transported across the other surface (2 m 0). The solution is very dilute in ethanol so that any convection of ethanol is negligible. a) (5 pts) Construct a diagram showing the mass shell balance for ethanol that can be used to determine the concentration profile in the ethanol-water film, and use this shell balance to determine an expression for NEIOHJ. b) (3 pts) What are the boundary conditions? c) (5 pts) Determine the concentration profile for this system in terms of z and any constants of integration. d) (2 pts) Based on the concentration profile determined in part c, determine N mun ,: - e) (5 pts) Calculate NHZO‘: . t) (3 pts) Determine an expression for the molar flux of ethanol relative to the molar average velocity. g) (2 pts) Determine an expression for the molar flux of water relative to the molar average velocity. Page 7 of 8 // C5?” @ a x C, g5; [W x” / 3 My f if; / ,f If.» / NR) 3 mm-mmv . 32.33;; if” 491:: “WWW Dam—MW rm...” M 8”" If. C? 3"? N“)??? S a)? gma j/ Nag}? NR? X‘Q/zm m Naggm x are/flréawga «3" ya (fliwmz/f (“mam {fall/1 agnWLfimham (£65919?) 2 g”? 35;; I! 4' w} g”: 6:: g 32} £3 m fiflxb \ wwafiféfiéfim i “Mi ‘ tfi’ 5%? m w m 4 a ‘5» :‘ng 933* £3 E???“ fl Em Taséaééé; 5 E2“? $5343 gag} . 3 “we 9‘ Wk? 1 I . 'L . . g a gn> N Egg? :2: vea’sQaflr-iw; if 42?; £393; ...
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This note was uploaded on 10/11/2011 for the course CHE 3333 taught by Professor Staff during the Fall '08 term at Oklahoma State.

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Exam I Prob #4 Soln - 4) Ethanol (A) and water (B) are in...

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