(1) Why is latent heat of vaporisation higher than latent heat of fusion?

Answer 1

well..this is because more heat is absorbed to overcome the attractive intramolecular forces between particles and also to do work against the atmospheric pressure so that water can be changed into vapour...so..does this answer ur question?? =) hav a nice day...

Answer 2

In thermochemistry, latent heat is the amount of energy in the form of heat released or absorbed by a substance during a change of phase (i.e. solid, liquid, or gas), - also called a phase transition.
Latent heat of fusion is the process whereby heat is absorbed without a change in temperature or melting point of a substance.
Latent heat of vaporisation is the absorption of heat or boiling point of a substance without any change in temperature.
More energy is required in latent heat of vapourisation because the molecules are broken free of their strong bonds in liquid to become air, rather than only becoming weaker to form a liquid in latent heat of fusion.
The equation for latent heat is:
Q = mL
where:
Q is the amount of energy required to change the phase of the substance,
m is the mass of the substance,
L is the specific latent heat for a particular substance.
In other words, specific latent heat is found when energy is divided by mass.
For example: water:
Latent Heat of Fusion, 334J/g at 0 Degree Celcius
Latent heat of vapourisation, 2272J/g at 100 Degree Celcius
More information is available at the following website.

Answer 3

In vapourisation, the molecules are separated from each other in conversion from liquid to vapour to a much larger distance than in case of melting from solid to liquid. The work to be done against the inter-molecular force of attraction is more when the separation is larger. Hence, latent heat of vapourisation is more than the latent heat of fusion.

Answer 4

latent heat of vaporisation is the amount of heat required to change the state from solid to gas(solid to liquid to gas) whereas latent heat of fusion is the heat required to change the state from solid to liquid only,hence latent heat of vaporisation is greater than the heat of fusion.

Answer 5

Also look at the density change. From solid to liquid the density does not change nearly as much as from liquid to gas. Especially at 1 Atmosphere. The molecules have to move much further apart as a gas.

Answer 6

This is due to the extra energy required for molecules to move more away from each other.You see in fusion not much volume change is there where as in vapo..... lot of volume change It multiplies

Answer 7

For melting the molecules are near one another. When evaporating, you practically suppress the interaction of molecules and you disrupt the matter . This requires a high amount of energy

Answer 8

This is simply not true.
For example latent heat of vaporization becomes zero near critical point.

Answer 9

more energy is required