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What is the main type of intermolecular forces in PH3?

What is the main type of intermolecular forces in PH3?

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Asked by Hanmstoddard, Last updated: Dec 19, 2024

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Anthony Paul Bonadio

Anthony Paul Bonadio

Its kind of my job to give answers

Anthony Paul Bonadio
Anthony Paul Bonadio, Teacher, MCA, PhD, Toledo

Answered Feb 26, 2019

PH3, otherwise known as phosphine and is quite toxic and flammable, forms a dipole-dipole because it is a polar molecule. We know it is polar because it has a lone pair and therefore its geometry is non-symmetrical as predicted by the VSEPR model.

Nonpolar molecules have a symmetrical distribution of charge, and the London dispersion is the weakest intermolecular force. Molecules with H-F, H-O, or H-N (because of big EN) are known as hydrogen bonding; saltwater (ionic compound and water) are known as non-dipole forces. Since PH3 is a polar molecule without H-F, H-O, or H-N, this qualifies as having dipole-dipole forces.

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hanmstoddard

hanmstoddard

hanmstoddard
Hanmstoddard

Answered Sep 10, 2018

Dipole-Dipole Forces

Nonpolar Molecules (Symmetrical distribution of charge)=London Dispersion (weakest); Polar Molecules (Asymmetrical distribution of charge)=Dipole-Dipole Forces; Molecules with H-F, H-O, or H-N (because of big EN)=Hydrogen Bonding; Saltwater (ionic compound and water)=Ion-Dipole Forces. Since PH3 is a polar molecule (it's asymmetrical overall, in terms of charge distribution) without H-F, H-O, or H-N, this qualifies as having dipole-dipole forces.*##**##*
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