Intermolecular Interactions

35 nh 084 oh 124 fh 178 same mass one is more

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Unformatted text preview: !.. NH H !+ H H H !+ .!N. ! ..- H HN Axially symmetric equatorially asymmetric HH !+ !.. N H H H! + It can be messy: !+ !- H The asymmetrical molecule is polar H H H !+ !.. N !+ H !- H H !+ :N They line up: :NH3 is also a weak hydrogen bonder too. (a lille later) 2'-1,("&)(34/"#5(+)%",46"7'8(84/"#-)6%" 9'84:."';"<=>" ('&$ (#'$01,*$ (*)$+,*$ !"#$%" (*&$ (!!$./,*$ (&&$ !"#$ !)#$-,*$ !)#$ !2&$ !'($ !%&$ !%&$ &$ (&$ %&$ '&$ )&$ !&&$ &'()*+(,-"&,.."#/01'(%" Something else is going on with ammonia. !(&$ !%&$ Dipole ­Instant Dipole A dipole interac+ng with a non ­polar molecule Dipole in X creates instantaneous dipole in Y Dipole ­Ion +! ! - + This will become a solubility rule. Hydrogen Bonding Strong dipole ­dipole interac+on 180o geometry in gas phase High value electronega+ve element C,N, O, F, P, S H-Bond Weakened O-H bond This Becomes Weaker At This Gets Stronger Hydrogen Bonding n=2 Boiling T (K) NH3 237.65 H2O 373.15 HF 293 CH4 NH3 H2O HF Boiling T (K) 185 213 188 n=3 PH3 H2S HCl ElectronegaFvity difference C ­H = 0.35 N ­H = 0.84 O ­H = 1.24 F ­H = 1.78 Same mass One is more polar H ­bonding II •  The O ­H...
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