Timeline for Molecules having higher enthalpy of vaporization and boiling point than another but with lower entropy of vaporization?
Current License: CC BY-SA 3.0
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| Feb 6, 2017 at 10:41 | comment | added | airhuff | Well, I may not have done a good job of answering your question then. The main point of my answer lies in table 2, which shows that 2 different processes control the enthalpy of vaporization, and similarly the saturation vapor concentration (also known as vapor pressure) or boiling point. At the low-molecular weight end, hydrogen bonding dominates, so we see the behavior common to polar, hydrogen-bonding compounds. At the high-MW end, we see the pattern observed for alkanes. I'll try to think of a better way to explain, but no guarantees ;) | |
| Feb 6, 2017 at 10:16 | comment | added | Jfrey | I realised the increase in boiling point for alcohols decreases as well. Both boiling point and enthalpy of vaporisation should reflect the strength of intermolecular forces, but since they refer to the vapour pressure needed and energy needed for vaporisation(which might not be used only to overcome the intermolecular forces) respectively, they probably don't change by the same percentage, what exactly is behind the difference? This is what still puzzles me. | |
| Feb 6, 2017 at 6:21 | history | answered | airhuff | CC BY-SA 3.0 |