A drop of liquid A of radius r1 is suspended in a stream of gas B. There is a spherical stagnant gas film of radius r2 surrounding the droplet. The concentration of A in the gas phase is Xa1 at r=r1 and Xa2 at the outer edge of the film, r=r2. By a shell balance show that for steady-state difussion r2NAr is a constant within the gas film.Use Navier Stokes equations

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