Answer to Question #98658 in Physical Chemistry for Abhishek

Question

State Trouton 's rule .

Answer 1

The molar entropy of evaporation of various substances at a normal boiling point is a constant value and is equal to the Trouton constant:

$\Delta S \upsilon = \Delta H\upsilon / T = K trouton$

K _Trouton = 85-88 J/(mol*K)

In a slightly different formulation, the Truton rule allows us to estimate the enthalpy of evaporation at the boiling point

$\Delta H\upsilon = 88 T\upsilon$