CHM ENG 150A Midterm: cheme150B-fa2014-mt1-Wallman-soln
8 Jan 2019
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Two solutions are separated by a thin lm 0. 3cm thick that can allow di usion of hcl (a) and water (b). The concentration of hcl at one side of the lm at point z1 is 0. 004 mol/cm3 and the concentration of hcl at the other side of the lm at point z2 is 0. 002 mol/cm3. The total concentration at both points is 0. 055 mol/cm3. The di usivity of hcl in water in the. Assume steady state: find an expression for the molar ux of hcl assuming that water does not di use. Cal- culate this ux: find an expression for the molar uxes of hcl and water assuming that they are related by na = -2nb. Solution: we can start with the expression for molar ux: + xa (na + nb) ca c (na + nb) . (1) (2) As water does not di use nb = 0, and we can rearrange to nd an exact expression for na:
