Enthalpy of Fusion Enthalpy of fusion is the enthalpy change accompanying the transformation of one mole of a solid substance into its liquid state at its melting point. it is also called molar enthalpy of fusion. The molar enthalpy of fusion ( Δ fus H ) of ice is +6 KJ mol-1. H2O ( s ) → H2O ( l ) Δfus H = + 6 KJ mol-1 The enthalpy of freezing has same value as … [Read more...] about Enthalpy Changes During Phase Transitions