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You are watching: Why is heat of vaporization greater than fusion

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Why is the latent warmth of vaporization of water better than the latent warmth of fusion of water? Asked by: FidelAnswerThe latent heat of fusion and also vaporization both involve the warm compelled to changethe state of a substance without a readjust in temperature. In the case of the latentwarm of fusion it is the heat compelled to readjust a substance from a solid (ice) to aliquid (water) or vice versa while the latent warm of vaporization from a liquid(water) to a gas (steam) or vice versa.In solids, the molecules are incredibly cshed together and the attractivity between themolecules are excellent. This causes a substance to have actually a structure in which themolecules have bit freedom to relocate, as you would certainly check out in the case of ice. In theinstance of a liquid, the molecules are very closely spaced, though not as carefully spaced as asolid, they have actually even more freedom to move and also the intermolecular pressures are weaker thatthat of a solid. Hence a liquid can circulation, unprefer a solid. Now in a gas, the moleculesare sufficiently far acomponent that tright here are bit to no attractive forces. Due to the fact that ofthis a gas have the right to easily be compressed and also take the shape of the container.Now as you warmth a solid turning it right into a liquid, you increase the kinetic energy ofits molecules, relocating them better acomponent until the forces of attraction are reducedto enable it to circulation freely. Keep in mind the forces of attraction still exists. Nowas you warm a liquid, turning it right into a gas, the kinetic energy of the molecules areboosted to a point where tbelow are no pressures of attraction in between the molecules.The power required to entirely sepaprice the molecules, relocating from liquid to gas,is much better that if you were simply to minimize their separation, solid to liquid.Hence the reason why the latent warm of vaporization is better that the latent heatof fusion.Answered by: David Latchmale, B.Ss. Physics, University of the West IndiesThe over answer is essentially correct, yet the folowing have to be additionally clarified:The difference in enthalpies originates from the truth that a liquid molecule is stabilized by interactions with other surrounding molecules (therefore a little warm of fusion) and a gas has actually very bit intermolecular stabilization (therefore a huge heat of vaporization). The confusion originates from the idea that temperature is a measure of the average kinetic energy of a mechanism, and because the temperature remains continuous, the average kinetic energy need to likewise remajor constant. The extra energy forced to reason a phase change is actually potential power. It is the energy required to conquer the bonds of nearemainder next-door neighbors to the allude that a phase shift deserve to take place. So it really isn"t a change in kinetic power.Answered by: Joe Larsen, Ph.D. Chemisattempt, Rockwell Science Center, Los Angeles, CA
"The true spirit of delight, the exaltation, the sense of being more than Man, which is the touchstone of the highest possible excellence, is to be found in mathematics as sucount as in poetry."Bertrand also Russell(1872-1970)


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