After completing this chapter, you should be able to satisfy the following objectives:

**1.** Explain qualitatively how molecular motion leads to diffusion

**2.** Describe Fick’s model of diffusion in words and equations, and use the model to solve steady-state binary diffusion problems without convection

**3.** Choose an appropriate reference velocity v_{ref} and solve Fick’s model for steady-state binary diffusion with convection

**4.** Estimate the diffusivity of gases and liquids in binary systems

**5.** Explain and use the linear driving-force model for mass transfer

**6.** Estimate mass-transfer coefficients

**7.** Explain the deficiencies in the Fickian model of diffusion

**8.** Describe how the Maxwell-Stefan model differs from the Fickian model ...

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