churro 38

[405169322]

between H₂S and H₂Se why does H₂Se have a higher boiling point even though it has a weaker dipole-dipole?

[Mahir_Hasan2C]

Due to the fact it has a higher molar mass it is a bigger molecule, thus it requires more energy.

[Richard Ku 4H]

The mass of the molecule with Se is much greater, and hence will experience a greater level of London dispersion forces. Mass and London dispersion forces are proportional.

[Claudia Luong 4K]

Although H2S has stronger dipole-dipole forces, the LDFs in H2Se are stronger than that of H2S. These forces are strong enough to overcome even the dipole-dipole forces of H2S.