## [Lecture 16] Eq. 16.5 and [HW4] Q3.1

Dear Tian, Can I ask you a question about eq. 16.5 of Lecture 16?

During the lecture Prof. Shih provided us with this expression for the solute flux N=-w*D/L*delta(C)+w*c*v
Why eq.16.5 has the term D/L that multiplies c*v too? In other words, the solute carried by the solvent isn't independent from diffusion?

And sorry, for what concerns the term delta(c), on the assignment it is written that it is c1-c2. But in this case, when c1>c2 the first term on the right hand side is negative but the diffusive flux is from reservoir 1 to 2. So shouldn't it be delta(c)=c2-c1? Thank you in advance! Best regards Alessandro Andreotti