I want a general list of things I can check/determine in order to be able to tell. I'm trying to do some homework, and I could have put the exact compounds I'm looking at, but I don't want a one-time answer. I want someone to tell me how to approach that kind of problem. Please.
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The two most important factors are
1. polarity of molecule
2. Molecular mass of the molecule
The lower the polarity of a molecule, the lower its boiling point. Examples: N2 and O2 both have extremely low boiling points. H2O, and NH3 both have high boiling points because they are very polar.
The higher the molecular mass of a molecule, the higher it's boiling point. We talked about N2 and O2 with there low boiling points. Now consider Br2. It's not polar either, but it's boiling point is much higher because it is more massive than N2 or O2.
1. polarity of molecule
2. Molecular mass of the molecule
The lower the polarity of a molecule, the lower its boiling point. Examples: N2 and O2 both have extremely low boiling points. H2O, and NH3 both have high boiling points because they are very polar.
The higher the molecular mass of a molecule, the higher it's boiling point. We talked about N2 and O2 with there low boiling points. Now consider Br2. It's not polar either, but it's boiling point is much higher because it is more massive than N2 or O2.