What will be the degree of dissociation of 0.1 M `Mg(NO_3)_2` solution if van't Hoff factor is 2.74 ?

What is the degree of dissociation for Ca(NO_(3))_(2) solution if van't Hoff factor = 2.4 ?

If alpha is the degree of dissociation of Na_(2)SO_(4) the van't Hoff's factor (i) used for calculating the molecular mass is

If alpha is the degree of dissociation of Na_(2)SO_(4) the van't Hoff's factor (i) used for calculating the molecular mass is

van't Hoff factor of Ca (NO_3) is

How is degree of dissociation and degree of association are related with van't Hoff factor ?