What do you mean by “NA” in mass transfer? – McqOptions

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1.	What do you mean by “NA” in mass transfer?
A.	Rate of oxygen transfer per unit volume of fluid
B.	Rate of oxygen transfer per unit volume of gas
C.	Avogadro number
D.	Rate of oxygen transfer per unit mass of solid
Answer» B.

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What do you mean by “NA” in mass transfer?