Only the water and the NaCl will diffuse. Only water and sucrose will diffuse until they reach equilibrium. Water diffuses from where the water is more concentrated to where the water is less concentrated. Water diffuses from where the dissolved solutes are more concentrated to where the dissolved solutes are less concentrated. Water diffuses from hypertonic to hypotonic.
Water diffuses into cells.
Water diffuses into sea water. Shown to the right is a model system. The semipermeable membrane is permeable to water, but not glucose. Water will move OUT of the membrane. Water will move INTO the membrane.