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Why do low molecular weight molecules have lower critical temperatures than high molecular weight molecules?
Can someone explain this? i know that water and ammonia have unnaturally high critical temperatures because of strong hydrogen bonds. However the question is why?
1 Answer
- Anonymous8 years agoFavorite Answer
if you have a molecule(a big one) it has more mass.
more mass means the bonds between these molecules are stronger( higher mass, stronger bond).
This is called a van der waals bond. It's weaker than covalent bonds, ionic and hydrogen bonds, but they exist between every molecule with mass, and it increases if the mass increases.
C8H18 and CH4, look them up. both have no bonds but vanderwaalsbonds, and you can see the C8H18's higher crit temperature?