The following question is based on fundamentals of mass tran

The following question is based on fundamentals of mass transfer concept: our text book is Fundamentals of Momentum, Heat and Mass Transfer 6e by James. R Welty et al. Focusing on chapters: 22.1~3& 24.1 & 24.2 (just for your reference)

Someone gave me this as an answer (below). I would like to know if this is the right answer. If so, what is the logic behind or how do you come up with that equation? Please explain and show your work!

If this is not the correct answer, please provide your answer with detailed explanation and show your work!

A spherical polymeric bead (R-0.5 cm) loaded with a protein drug is allowed to release the protein into aqueous solution. The concentration of the protein outside the bead (CA) is measured along with radial distance from the center of the bead (r). Assume that the drug release follows steady-state diffusion and there is no bulk flow. You find that the molar flux at r-3 cm is 3.2x10\"12 mol/cm2 s. You also know CA at two different r as given below. Calculate a diffusion coefficient of the protein drug in cm-/s. r (cm 0.05

Solution

the methood by which this question has been solved is correct and this is the formula from ficks law .

so this is right approach ..i request to you pls read about ficks law i am sure you will be satisfy