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Melting Point -PCl3 and PCl5

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Hi guys ,

Here is the questiion can you please help me with that and explain it to me .

Compare the melting points of PCl3 and PCl5 and explain the difference.

Thnx

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The intermolecular forces between molecules of PCl5 are larger than the ones in PCl3 - thus a higher boiling point the PCl5 molecule is much larger than the PCl3 and the larger number of protons and electrons in the PCl5 molecule make the dispersion attractions greater.

http://www.chemguide.co.uk/atoms/bonding/vdw.html

this website should help give you a clearer answer though.

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