#intermoelcular forces

[er-cryptid]

Vapor Pressure and Intermolecular Forces [Ex. 1]

Does H2O or NH3 have a higher vapor pressure, based on intermolecular forces?

-- draw the structures

-- both have dispersion forces, because dispersion forces affect all molecules

-- both have hydrogen bonds

-- H2O has a hydrogen bonded to an oxygen, which is stronger than a hydrogen bonded to a nitrogen because oxygen is more electronegative than nitrogen

-- H2O has stronger intermolecular forces

-- stronger intermolecular forces = lower vapor pressure

-- NH3 has a higher vapor pressure

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