Boiling Point Q: Is Alcohol Higher Than Ammonia?

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Discussion Overview

The discussion centers around the boiling points of alcohol and ammonia, specifically comparing their boiling points and the factors influencing them, such as hydrogen bonding and molecular weight. The scope includes theoretical considerations of intermolecular forces and their effects on boiling points.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant suggests that ammonia's hydrogen bonding leads to a higher boiling point compared to alcohol, drawing parallels with hydrogen fluoride and water.
  • Another participant agrees with the importance of hydrogen bonding in increasing boiling points, specifically mentioning methanol as a liquid at room temperature.
  • A participant questions the definition of CRC, leading to a clarification that it stands for Chemical Rubber Company, which was historically significant for chemists.
  • Another participant discusses the arrangement of intermolecular forces, noting that lower molecular weight compounds may be nonpolar and could have lower boiling points due to a lack of intermolecular attraction.

Areas of Agreement / Disagreement

Participants express differing views on the boiling points of alcohol and ammonia, with some supporting the idea that hydrogen bonding plays a significant role, while others introduce considerations of molecular weight and polarity. The discussion remains unresolved regarding which compound definitively has a higher boiling point.

Contextual Notes

There are limitations regarding the assumptions made about molecular weight and intermolecular forces, as well as the definitions of terms used in the discussion. The relationship between boiling point and intermolecular attraction is not fully resolved.

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I think the answer is e). I don't think it is ammonia because of the hydrogen bonding between nitrogen and hydrogen. This will result in a higher boiling point. This is the same with Hydrogen fluoride and water. However, the two organic molecules I'm not sure. I assume that since the alcohol is a polar molecule and thus have stronger dipole-dipole interactions thus, a higher boiling point. Am i correct? Thanks.
 

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Methanol exists at RT as a liquid. You are correct the notion of hydrogen bonding increasing the bp (not only for the inorganics but for methanol as well). And if you have a CRC Handbook of Chemistry and Physics, you will find that you are in fact correct.
 
DrMark said:
Methanol exists at RT as a liquid. You are correct the notion of hydrogen bonding increasing the bp (not only for the inorganics but for methanol as well). And if you have a CRC Handbook of Chemistry and Physics, you will find that you are in fact correct.

Thanks, I'm just wondering, what does CRC stand for?
 
Not too sure if they've changed the definition, but originally CRC = Chemical Rubber Company:

http://www.hbcpnetbase.com/

A chemists constant companion back in the day.
 
You can arrange the strength of intermolecular bonding-dipole dipole, hydrogen bonding, van der wall (low or high molecular weight), etc...

which one of the compounds has a low molecular weight, and would suspect to be nonpolar?

Note that it is asking for the lowest boiling point-lack of intermolecular attaction.



very nice
 

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