The diffusivity D. in a binary gas mixture is related to the pressure (P) as__________________?
Correct answer: C. D ∝ 1/P
- A. D ∝ P0.5
- B. D ∝ 1/P0.5
- C. D ∝ 1/P
- D. D ∝ 1/P1.5
Explanation
Gas-phase diffusivity varies approximately inversely with total pressure because increasing pressure reduces the mean free path of molecules. Thus, at fixed temperature, D is proportional to 1/P.
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