Boiling point

[sarahtang4B]

Would NH3 have a lower boiling point compared to CH4 because NH3 has a lone pair of electrons?

[Courtney Quan 1C]

Look at the intermolecular forces present: NH₃ has the capacity to form hydrogen bonds because of its H-N bond. Hydrogen bonds, which are the strongest intermolecular forces, also have dipole-dipole and London forces (in descending order of strength of the intermolecular forces). CH₄, on the other hand, only has London forces (which ALL molecules have) and is the weakest intermolecular force. As such, NH₃ has a higher boiling point.

[305127455]

Melting and boiling point depend on intermolecular forces. NH3 is polar with its two lone-pair electrons when CH4 is not. As a result, intermolecular forces between NH3 molecules are stronger.

[Chloe Likwong 2K]

To sum up the previous comments, the stronger the bond, the higher the boiling point.

[Claudia Luong 4K]

NH3 can have Hydrogen bonding (between H and N), dipole-dipole (due to NH3 being a polar molecule), and London dispersion forces. CH4 is nonpolar so it only has London dispersion forces. NH3 has more and also stronger intermolecular forces, so it will have a higher boiling point.

[allisoncarr1i]

To sum up the previous comments, the stronger the bond, the higher the boiling point.

Is this due to the difficulty of breaking those bonds or for a different reason?