[heaven7]

 Based on Rault’s law could you give me the explanation of osmosis?

I know that it states that the ratio of the partial vapour pressure of each component to its vapour pressure as a pure liquid pA/pA* is  approximately equal to the mole fraction of A in the liquid mixture. pA = xA p*A but I don't know how to apply it to osmosis.

Thanks for Your help

[Riley_5000]

Start here:

1) The chemical potential of a solution vs chemical potential of pure solvent (assume permeate = pure water)

2) The mole fraction (vapour pressure) influences the chemical potential . . . .