Unit of molal diffusivity is____________________?
Correct answer: C. gm moles/cm. sec
- A. cm2/sec gm . mole
- B. gm moles/cm2 . sec
- C. gm moles/cm. sec
- D. gm moles/cm2. sec
Explanation
Molal diffusivity is a concentration-weighted diffusivity, so its units are molar concentration multiplied by diffusivity: (gm mol/cm³)(cm²/s) = gm mol/(cm·s). Therefore option c has the correct units, unlike ordinary diffusivity, which is expressed in cm²/s.
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