The theory of ideal gases postulates that gas particles are points in space that

Question

The theory of ideal gases postulates that gas particles are points in space that do not attract or repel each other. In solids and liquids, however, such intermolecular forces are vital to holding a substance together. These forces give rise to the characteristic properties of solids and liquids, such as possessing a definite volume, havinga shape (solids), exhibiting surface tension (liquids), etc. 4) a. b. c. What are the relative strengths of the intermolecular forces in solids, liquids, and gases? How do intermolecular forces qualitatively relate to melting and boiling point temperatures? Based on your understanding of intermolecular forces, which should be greater for a given substance: the heat of melting or the heat of vaporization? Why?

Explanation / Answer

A.

Strength of intermolecular forces is in the order of:

Gases < Liquids < solids

B.

Higher is the intermolecular forces among the molecules of solids or liquids higher is the melting or boiling point of solids or liquids respectively.

C.

Heat of melting is greater than heat of vaporization.

Because in solid state the strength of intermolecular forces is higher than that of in liquids. Hence, heat rquired to melt a solid is higher than the heat required to vaporize a liquid.

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