In case of non-ideal gases and liquids, the molal diffusivity ________________?
Correct answer: C. Is independent of pressure
- A. Varies inversely as the pressure
- B. Varies directly as the pressure
- C. Is independent of pressure
- D. Is equal to the volumetric diffusivity
Explanation
Molal diffusivity is defined on a molal or chemical-potential basis, which accounts for non-ideal behaviour rather than following the ordinary gas diffusivity rule of decreasing inversely with pressure. In this treatment it is taken as independent of pressure.
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