Spontaneity

Given entropy of vaporisation

%3D58%20%5C%2CJ%20K%20%5E%7B-1%7D%5C%2C%20mol%20%5E%7B-1%7D

i.e., entropy change when 1 mole of the liquid vapourises

%3D58%20%5C%2CJK%20%5E%7B-1%7D

%5Ctherefore

Entropy change when

1

mole of the liguid condenes

%3D-58%20JK%20%5E%7B-1%7D%5C%2C%5C%2C%20(%5Cbecause

Condensation and vaporisation are opposite process). Moles of the liquid used in the reaction

%3D%5Cfrac%7B100%7D%7B58%7D%3D1.72%5C%2C%20mol

%5Ctherefore

Entropy change when

1.72

mole (or

100%5C%2C%20g

) of the liquid condenses

%3D%5Cfrac%7B-58%20%5Ctimes%201.72%7D%7B1%7D

%3D-100%5C%2C%20JK%20%5E%7B-1%7D

Chapter Questions
1 MCQs