Enthalpy Change during Phase Transformation 🔴 Chemistry for Class 11

In this Thermodynamics (Chemistry) video in Hindi for Class 11 we explained what phase enthalpy or enthalpy change during phase transformation is. We also derived the relation between change in internal energy and standard enthalpy of vaporisation.

Standard enthalpy of fusion : It is the amount of energy required to convert one mole of solid into liquid.

Standard enthalpy of vaporisation : It is the amount of energy required to convert one mole of liquid into gas.

Standard enthalpy of sublimation : It is the amount of energy required to convert one mole of solid into gas.


Relation between change in internal energy and standard enthalpy of vaporisation :

ΔU = n (Δᵛᵃᵖ H° - RT)


0:00 Introduction to Phase Change
0:00 Standard Enthalpy of Fusion
0:00 Standard Enthalpy of Vaporisation
0:00 Standard Enthalpy of Sublimation
0:00 Relation between ΔU and Standard Enthalpy of Fusion