Mass Transfer
Molecular diffusion is caused by the

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

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Mass Transfer
The rate of solid-liquid extraction is limited by the

Diffusion of the solute from the solution in contact with the particle to the main bulk of the solution
Phase change of the solute as it dissolves in the solvent
All of these
Diffusion of the solute through the solvent in the pores to the outside of the particle

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