Question

explain entropy change during phase change​

Answer 1

Answer:

Entropy during phase change -

(1) Entropy of fusion

Solid → Liquid (Process of conversion of solid to liquid is called fusion).

We know that,

∆S = q/T

So,

∆S_fusion = q_fusion/Tm

Where Tm denotes melting point.

(2). Entropy of vaporization

Liquid → Gas (Process of conversion of liquid to gas called vaporization).

We know that,

∆S = q/T

So,

∆S_vapourization = q_vapourization/Tb

Where Tb denotes boiling point

_______________

For most of the liquids,

entropy for vaporization is in between 85 to 88 KJ/mol.

Therefore,

∆H_vapourization/Tb = 88 (maximum)