Get Molar Heat Of Fusion And Molar Heat Of Vaporization Worksheet

The molar heat of fusion ( Δ H fus ) of a substance is the heat absorbed by one mole of that substance as it is converted from a solid to a liquid. Since the melting of any substance absorbs heat, it follows that the freezing of any substance releases heat.

The heat of fusion is the amount of energy that is required to completely melt (convert from solid to liquid) a given substance while the heat of vaporization is the amount of energy that is required to completely vaporize (convert from liquid to gas) a substance.

Every substance has its own molar heat of vaporization. The units for the molar heat of vaporization are kilojoules per mole (kJ/mol). Sometimes the unit J/g is used. In that case, it is referred to as the heat of vaporization, the term 'molar' being eliminated.

The molar heat of vaporization is greater than that of molar heat of fusion due to the larger amount of energy required to break the strong attractive forces that exist between molecules of liquids than that of the attractive forces in molecules of gases.

Latent Heat of fusion is the amount of heat required to change from solid to liquid or released in a phase change from liquid to solid. Likewise, Latent heat of vaporization is the amount of heat needed to change liquid to vapor or released when vapor condenses back to liquid.

The molar heat of fusion is the amount of heat required to make one mole of a solid substance change into a liquid state. The molar heat of vaporization, on the other hand, is the amount of heat required to make one mole of a liquid substance change into a gaseous state.

Notice that for all substances, the heat of vaporization is substantially higher than the heat of fusion. Much more energy is required to change the state from a liquid to a gas than from a solid to a liquid. This is because of the large separation of the particles in the gas state.

Vaporization is the process of formation of vapor from a liquid, which can happen in one of the two ways: evaporation and boiling. The key difference between fusion and vaporization is that fusion is the conversion of a solid into a liquid, whereas vaporization is the conversion of a liquid into its vapor.

3:24 16:49 Molar Heat of Fusion and Molar Heat of Vaporization - Explained - YouTube YouTube Start of suggested clip End of suggested clip So there is no change in temperature. However. There is a change in state of matter going on we'reMoreSo there is no change in temperature. However. There is a change in state of matter going on we're converting this water into water vapor.