Why is the boiling point of methylamine -6 degrees celsius and ethane is -89 degrees celsius if they have similar molar masses?
2007-03-25 05:59:48 · 3 answers · asked by glance 3 in Science & Mathematics ➔ Chemistry
look at their structures, how they pack.
see if there are bonds formed of broken because of adjacent molecules staying near each other.....
these are the things you should look for if the molar masses are similar.
ps ethane is a hydrophobic, non polar molecule. methylamine has a nitrogen.... does that not make you think of hydrogen bonds forming?!? H bonds increase boiling point because they are stronger than hydrophobic interactions between molecules tlike ethane, so therefore they need more energy to be broken.
hope that helped a little!
good luck with your chemistry.
2007-03-25 06:03:55 · answer #1 · answered by Vidya 6 · 0⤊ 1⤋
Ethane only has weak van der Waals' forces of attraction. Methylamine has the much stonger hydrogen bonding, therefore its boiling point is higher.
2007-03-25 13:06:20 · answer #2 · answered by Gervald F 7 · 0⤊ 0⤋
similar molar masses do not dictate boiling points.
2007-03-25 13:03:48 · answer #3 · answered by Anonymous · 0⤊ 2⤋