What movement of molecule will occur

Diffusion. Diffusion is essentially the movement of molecules from a region of higher concentration to a region of lower concentration as a result of thermal motion. Diffusion is an important process in human physiology.

It will move from right to left.
Remember that in osmosis, the diffusion of water, molecules will move from a higher concentration to a lower concentration. Since the ones on the right is of higher concentration and the left of a lower concentration, the substance will move left.