Benzene, a contaminant in groundwater, is diffusing into an inert porous mineral particle at 25C. The particle
Question:
Benzene, a contaminant in groundwater, is diffusing into an inert porous mineral particle at 25°C. The particle has a void fraction of 0.40 with a mean pore diameter of 0.30 mm, and the pores are filled with groundwater. The molecular weight of benzene (solute A) is 78 g/gmole, and the critical volume (Vc) is 259 cm3/gmole. The mass concentration of benzene in the groundwater surrounding the particle is 0.100 g/L, which is below its solubility limit.
a. What is the molar concentration of benzene in the groundwater?
b. What are the mole and mass fractions of benzene in the groundwater?
c. Estimate the molecular diffusion coefficient of benzene in groundwater.
d. Justify why hindered diffusion of the benzene solute through the solvent-filled pore can be ignored.
e. Estimate the effective diffusion coefficient of benzene within the water-filled porous mineral particle.
Step by Step Answer:
Fundamentals Of Momentum Heat And Mass Transfer
ISBN: 9781118947463
6th Edition
Authors: James Welty, Gregory L. Rorrer, David G. Foster