Define the term equimolar counter diffusion. To maintain the pressure of an indu

Question

Define the term equimolar counter diffusion. To maintain the pressure of an industrial pipeline containing ammonia gas at 1 atm it is vented to ambient air. Venting is achieved by tapping the pipe and inserting a 50mm diameter tube, which extends for 0.2m into the atmosphere. The whole system is operating at 25 degree C. Stating your assumptions, including that Equimolar counter diffusion is occurring, determine the mass rate of ammonia lost to the atmosphere. After 72 hours of venting, determine the actual mass of ammonia lost to the atmosphere and the mass of air contaminating the pipe. Data: Ammonia-air diffusivity at 298K 0.28 times 10^-4 Molecular weight of ammonia 17 Molecular weight of air 29

Explanation / Answer

Equimolar counter diffusion: Equimolar counter diffusion occurs when the fluxes of two substances are equal and opposite in direction. During this whole equimolar counter diffusion process the pressure is kept constant.

Suppose JA and JB are the fluxes of substances A and B. In equimolar counter diffusion condition:

JA = - JB

In other words if some amount of substance A has diffuse away, then the same amount of substance B takes place to diffused substance A.

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