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Penetration theory states that the mass transfer co-coefficient is equal to (where, De is diffusivity and ‘t’ is time) ?

Penetration theory states that the mass transfer co-coefficient is equal to (where, De is diffusivity and ‘t’ is time) ?

A. (De.t)1/2
B. (De/t)1/2
C. (4De/πt)1/2
D. (4De/t)