Association and dissociation

Vont hoff factor| Its relation with degree of dissociation and association

The van't Hoff factor I for an electrolyte which undergoes dissociation and association in solvent place as follows

For solutes which do not undergo any association or dissociation in a solute, van't Hoff factor (i) will be

A 2% solution of cane sugar is isotonic with 0.5%x solution.The molecular weight of substance 'x' is [Assume that x does not undergo association or dissociation]

An aqueous solution boils at 100.50^(@)C .The freezing point of the solution would be (K_(b) for water =0.51^(@)C//m),(K_(f) for water =1.86^(@)C//m ) [no association or dissociation]