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Posted: **Mon May 16, 2022 1:13 pm**

: A Species A Diffuses Radially Outwards From A Sphere Of Radius Ro The Following Assumptions Can Be Made The Mole Fract 1 (83.5 KiB) Viewed 64 times

A species A diffuses radially outwards from a sphere of radius ro. The following assumptions can be made. The mole fraction of species A at the surface of the sphere is Xao. Species A undergoes equimolar counter-diffusion with another species B. The diffusivity of A in B is denoted DAB. The total molar concentration of the system is c. The mole fraction of A at a radial distance of 10ro from the centre of the sphere is effectively zero.
(a) Determine an expression for the molar flux of A at the surface of the sphere under these circumstances. Likewise determine an expression for the molar flow rate of A at the surface of the sphere. [12 marks]