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

Equimolar counterdiffusion of A and B occurs through a spherical film

1.	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
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>