Chemical Forums
Chemistry Forums for Students => High School Chemistry Forum => Chemistry Olympiad and other competitions => Topic started by: Loael on March 18, 2013, 11:41:55 PM
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Okay, so I'm trying to study for the Olympiad and these two questions appeared:
Which process is exothermic?
A) Condensation
B) Fusion
C) Sublimation
D) Vaporization
The answer to this was A, so I assumed that fusion is an endothermic process.
Then this question comes up:
Rank the enthalpies of fusion, sublimation, an vaporization for water.
A) sublimation=vaporization=fusion
B) vaporization < sublimation < fusion
C) fusion < sublimation < vaporization
D) fusion < vaporization < sublimation
The answer to this was D.
This question really bothered me because shouldn't fusion have the HIGHER enthalpy value because it is endothermic? Please help me with this concept.
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Fusion is the process of conversion of a solid to a liquid. It is endothermic but the energy required for this phase change is usually lesser than that required for converting a liquid into a gas i.e. vaporization.