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Effective diffusivity (DE) in a catalyst pellet is related to molecular diffusivity (DN) and Knudsen diffusivity (DK) as_________________?

Effective diffusivity (DE) in a catalyst pellet is related to molecular diffusivity (DN) and Knudsen diffusivity (DK) as_________________?

A. DE = DM + DK
B. 1/DE = 1/DN + DK
C. DE = DM . DE
D. DE = DN/DE