Problem: For the following pair of compounds, pick the one with the higher vapor pressure at a given temperature: NH3 or PH3.

FREE Expert Solution

We are being asked to determine the compound with a higher vapor pressure between NH3 and PH3


Recall that Vapor pressure is the pressure exerted by a vapor in equilibrium with its condensed phase and is highly influenced by intermolecular forces between molecules.


Intermolecular Forces (IMF) are the attractive forces between 2 molecules:

Ion-dipole

strongest IMF → deals with the attraction between an ion and a polar compound.

 Hydrogen Bonding

2nd strongest IMF →  exists anytime hydrogen is directly connected to fluorine, oxygen or nitrogen

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Problem Details

For the following pair of compounds, pick the one with the higher vapor pressure at a given temperature: NH3 or PH3.

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Intermolecular Forces and Physical Properties concept. If you need more Intermolecular Forces and Physical Properties practice, you can also practice Intermolecular Forces and Physical Properties practice problems.