Boiling Point

[Nathan Mariano 2G]

How do you determine which compound has the higher boiling point if they both have similar intermolecular forces? For example, H2S and H2Se.

[gillianozawa4I]

H2Se has the higher boiling point because it has a larger mass and more electrons. Because Se has more electrons, it is more polarizable and therefore has stronger London Dispersion Forces than H2S. This causes it to have a higher boiling point. Hope this helps!

[katie_sutton1B]

After identifying the intermolecular forces, you would want to look at the size, or amount of electrons in the atom. The more electrons there are, the more polarizable it is. The more polarizable element has the strongest Van der Waals forces and therefore Se would be the higher boiling point.

[taywebb]

Does H2Se have dipole-dipole forces as well as London dispersion forces?

[Eruchi Okpara 2E]

Can't you also determine which compound has a higher/ lower boiling point by looking at branching?

[Heidi Ibarra Castillo 1D]

H2Se has the higher boiling point due to having a larger mass and more electrons

[Heidi Ibarra Castillo 1D]

^H2Se does have dipole dipole forces