The dissolution of ammonium chloride in water is an endothermic process but still it dissolves in water readily. Why ?

Explanation

This is because of entropy change. In this case, `DeltaS` is positive.
`NH_(4)Cl (aq) rarr NH_(4)^ (o+) (aq) + Cl^(ө) (aq)`
The ions that were held together in the crystalline solid are free and move in all possible directions. Its entropy increases and then `T DeltaS gt DeltaH`.