Question

Why the enthalpies of fusion for all reactions are positive?

Answer 1

Standard Enthalpy of fusion:

• “The enthalpy change that accompanies the melting of one mole of a solid substance in a standard state is called standard enthalpy of fusion or molar enthalpy of fusion.”

Sign of Enthalpies of fusion:

• Since the melting of solid is an endothermic process.
• Therefore, enthalpies of fusion for all the reactions are positive