In a vapor-liquid contacting equipment, the overall gas phase mass transfer co-efficient (M.T.C), KG is related to individual co-efficients (KG and KL) as ___________________ ?

A. 1/KG = 1/KG + m/KL

B. KG = 1/KG + m/KL

C. KG = 1/KL + m/KG

D. 1/KG = 1/KL + m/KG

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