* Diffusion is the movement of molecules from an area of higher concentration to an area of lower concentration. This movement is driven by the random motion of molecules and their tendency to spread out.
* Impermeability means that a molecule cannot pass through a membrane or barrier.
For diffusive equilibrium to occur, molecules need to be able to move across the barrier. If a molecule is impermeable, it cannot move, and therefore cannot reach a state of equilibrium where its concentration is equal on both sides of the barrier.
In summary:
* Diffusive equilibrium requires movement.
* Impermeability prevents movement.
Therefore, diffusive equilibrium cannot occur for an impermeable molecule.
