It has to do with hydrogen bonding and polarity of the molecule as well as with the molar mass. Increasing molar mass generally means higher boiling points. So in this case, decreasing the molar mass would mean lower boiling points. But H2O is way out of line since H2S is a gas H2O should be a gas even at lower temperatures BUT it isn't. It's good to remember that
a)in the same column (as these compounds are), the size makes the larger difference (here it is the size and the molar mass).
b) in the same row, its the electronegativity.
Which has highest boiling point?
H20, H2S, H2Se, H2Te
i know its H20, but why? is it because its dipole dipole? does it have to do with electronegative, or polarity?
2 answers
Why do oxygenated fuels contain less energy than hydrocarbons?
1 answer