Because NH3 has a much larger difference in its electronegativity values than of Cl2. Cl2 have a 0 difference which causes it to have weaker forces of attraction.
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Hydrogen Bonds
hydrogen bond
nh3-nh3 because they are both polar molecules
dispersion, dipole-dipole, and hydrogen bonding forces
CO2
Look at intermolecular forces and judge from there
hydrogen bond
co2
NH3 exhibits hydrogen bonding in addition to dispersion forces. This significantly increases the intermolecular force, and raises the boiling point. PH3 does not exhibit hydrogen bonding and the dominant intermolecular force holding these molecules together is dispersion forces. (Dispersion forces also known as Van Der Waal Force)
Correct answers from Mastering Chemistry: NH3 - hydrogen bonding CH4 - Dispersion forces NF3 - dipole-dipole
Among these NH3 is the weakest base so strongest conjugate acid would be NH4+ ion.
nh3-nh3 because they are both polar molecules
dispersion, dipole-dipole, and hydrogen bonding forces
In vanderwaal's Equation 'a' measures the intermolecular force of attraction and 'b' measures the volume of the molecule. N2 has greater volume (due to it's larger size) and hence 'b' is greater for N2. NH3 has greater dipole moment and hence 'a' is greater for NH3.
CO2
Look at intermolecular forces and judge from there
Ammonia form hydrogen bonds.
Hydrogen fluoride HF has the strongest hydrogen bonding. Water H2O and ammonia NH3 have the next strongest hydrogen bonding.