He gives his name to an equation relating the change in temperature, equilibrium constant, and (*) Gibbs free energy, but he is most notable for a factor appearing in equations involving colligative properties  
Independently of Le Bel, this man developed a stereochemical model of the optical activity of certain compounds.  This chemist's name is sometimes appended to Le Chatlier's principle and he used a system of a piston with two semi-permeable membranes to derive an equation for osmotic pressure.  He gives his name to an equation relating the change in temperature, equilibrium constant, and (*) Gibbs free energy, but he is most notable for a factor appearing in equations involving colligative properties  For 10 points, name this Dutch chemist who names the factor i representing dissociation, the first Nobel laureate in chemistry.
Independently of Le Bel, this man developed a stereochemical model of the optical activity of certain compounds.  
Jacobus Henricus {van 't Hoff}