Question: A mixture of He (A) and Ar (B) is diffusing through an open capillary tube with a length of 15 mm and a radius of

A mixture of He (A) and Ar (B) is diffusing through an open capillary tube with a length of 15 mm and a radius of 1000 A at 298 K. The total pressure is 1.013x105 Pa. The molecular diffusivity at 1.013x104 Pa is DAB = 7.29x10-4 m2/s. Based on this information: a) Calculate the Knudsen diffusivity of helium. b) Determine the type of diffusion inside the capillary tube by calculating the Knudsen number. c) Calculate the diffusion flux in the steady-state condition when xA1 = 0.8 and xA2 = 0.2.

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