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2. A droplet of substance A is suspended in a stream of gas B. The droplet radios ish. We postulate that there is a spherical stagnant gas film of radius n. The concentration of A in the gas phase is y at r=and yxat r=12 (a) By a mole balance (ignore the flux in 0 and 2-directions), show that for steady-state diffusion Nx, is a constant and set the constant equal to i Narl, the value at the droplet surface (6%) (b) Find out as a function of dya/dr. (79) (0) Find Nw between the timits and (d) If a mass transfer coefficient, is defined by Nur Apu-pu) show that when 2D).D (P.) in which is the droplet diameter. Gas fim