Mass Transfer
Molecular diffusion is caused by the

Activation energy of the molecules
Potential energy of the molecules
Thermal energy of the molecules
Transfer of molecules from low concentration to high concentration region

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Mass Transfer
In case of absorption with exothermic reaction, for fluids having

Pr = Sc = 1; total mass, momentum and thermal diffusivity will be the same
Pr = Sc ; there won
Both A & B
Pr = Sc; percentage change in heat and mass transfer flux will be the same for a given change in the degree of turbulence

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