Exam I Prob #4 Soln

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

This preview shows pages 1–3. Sign up to view the full content.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

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; ...
View Full Document

## 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.

### Page1 / 3

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

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online