Chlorobenzene diffuses into an inert porous mineral particle at 25 C. The porous particle has a void fraction of 0.25 with a mean pore diameter of 0.10 micrometers and the pores are filled with groundwater. The mass of chlorobenzene concentration in the groundwater surrounding the particle is 0.050g/L.

a. Estimate the molecular diffusion coefficient of chlorobenzene in the bulk groundwater surrounding the porous particle. Hint: You will need to choose an appropriate correlation for the diffusion coefficient here.

b. Estimate the effective diffusion coefficient of chlorobenzene within the water-filled porous mineral particle. Even if you think hindered diffusion can be ignored, you should prove it here. Hint: You will need to make an estimation of the diameter of a chlorobenzene molecule.