Penetration theory states that the mass transfer co-coefficient is equ – McqOptions

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1.	Penetration theory states that the mass transfer co-coefficient is equal to (where, D e is diffusivity and ' t ' is time)
A.	( D e .t ) 1/2
B.	( D e /t ) 1/2
C.	(4 D e /? t ) 1/2
D.	(4 D e / t )
Answer» D. (4 D e / t )

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