Equimolar counterdiffusion of A and B occurs through a spherical film of i.d=ri and thickness . The flux of A is NA1 at r=ri. The flux through a flat film of the same thickness is NA2. if NA1 is larger than NA2 by 5%, the film thickness is

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1.	Equimolar counterdiffusion of A and B occurs through a spherical film of i.d=r_i and thickness . The flux of A is N_A1 at r=r_i. The flux through a flat film of the same thickness is N_A2. if N_A1 is larger than N_A2 by 5%, the film thickness is
A.	0.025r<sub>i</sub>
B.	0.05r<sub>i</sub>
C.	0.1r<sub>i</sub>
D.	0.01r<sub>i</sub>
Answer» C. 0.1r<sub>i</sub>

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