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Mass Transfer - Engineering

Q1:

Unit of molal diffusivity is

A cm2/sec gm . mole

B gm moles/cm2 . sec

C gm moles/cm. sec

D gm moles/cm2. sec

ANS:C - gm moles/cm. sec

The unit of molal diffusivity is cm^2/sec (centimeter squared per second). Molal diffusivity (𝐷𝑚Dm​) is defined as the diffusivity of a solute in a solvent, expressed in terms of molality (moles of solute per kilogram of solvent) and the rate at which the solute diffuses through the solvent. The unit of molal diffusivity is obtained by dividing the unit of area (cm^2) by the unit of time (sec). Therefore, the correct option is gm moles/cm^2. sec.