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    Explain why the boiling temperature of PH3 is greater than that of CH4.
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    What do you know about how intermolecular forces relate to boiling points?

    What happens to the strength of London dispersion forces as the number of electrons increases?

    Is one of these molecules polar?
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    Molecules with hydrogen bonds have a stronger boiling point. What are London dispersion forces? Phosphorous and carbon are slightly electronegative?
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    Generally molecules with stronger intermolecular forces will have higher boiling points

    London dispersion forces are temporary dipoles, overall they are a net attractive force. They may have been introduced to you as van der Waals forces but that in't strictly correct, VDW is more than just this.

    PH3 has 8 more electrons than CH4 does so you would expect it to have stronger London dispersion forces

    PH3 also has a dipole due to how the atoms are arranged so it would experience dipole-dipole forces which CH4 does not
 
 
 
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