Thermodynamics and Thermochemistry
    1.0 Introduction to Thermodynamics
    2.0 Thermodynamic Processes
    3.0 Heat $(Q)$
    4.0 Work $(W)$
    5.0 Internal Energy
    6.0 Zeroth Law of Thermodynamic
    7.0 First Law of Thermodynamics
    8.0 Heat Capacity
    9.0 Enthalpy $(H)$ or Heat Content
    10.0 Significance of $?H$ and $?E$
    11.0 Relationship Between $?H$ and $?E$
    12.0 Standard Enthalpy of Reaction
    13.0 Law of Thermodynamics
    14.0 Bond Energy or Bond Enthalpies
    15.0 Second Law of Thermodynamic
    16.0 Entropy (S)
    17.0 Spontaneous Processes
    18.0 Free Energy (G)
    19.0 Enthalpy, Entropy, Free Energy Changes and The Nature of Process
    20.0 Standard Free Energy Change
    21.0 Coupled Reactions
    22.0 Third Law of Thermodynamic
    23.0 Important Facts

16.3 Entropy Change in Phase Transformation
Solid changing to liquid $\Delta {S_f} = \frac{{\Delta {H_f}}}{{{T_f}}}$

Liquid changing to vapour $=$ $\Delta {S_V} = \frac{{\Delta {H_V}}}{{{T_b}}}$

${\Delta {H_f}}$ and ${\Delta {H_V}}$ are the molar heat of fusion and molar heat of vapourisation respectively.

${T_f}$ and ${T_b}$ are freezing point and boiling point respectively.

Trouton's Law- Ratio of molar heat of fusion and boiling point is constant for those liquids which do not show hydrogen bonding or some special type of bonding.
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