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Molecule A has hydrogen bonds; Molecule B is non - polar. Which of the molecular liquids...

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Chemistry

Molecule A has hydrogen bonds; Molecule B is non -polar. Which of the molecular liquids will have the higher boilingpoint? Why? Also, which of the molecular liquids will have thelower vapor pressure? Why?

Answer & Explanation Solved by verified expert
3.8 Ratings (553 Votes)
Ans The strongest type of dipoledipole force is the hydrogen bond While it includes the word bond in its name this is NOT a chemical bond as it is still much weaker than either an ionic bond or a covalent bond Hydrogen bonds are the type of intermolecular force found in water and they give water some very impressive properties including a very high specific heat and the ability to dissolve many ionic compounds The greater strength of a hydrogen bond intermolecular force comes from the combination of a molecules strong dipole moment and the very small size of the hydrogen atom In water for instance the smaller hydrogen atom of one water molecule is able to get its slight positive charge very close to the slight negative of the oxygen atom on another water molecule and the short distance between the relatively large partial charges makes the attraction stronger than in other dipoledipole attractions In order for a compound to exhibit hydrogen bonding its molecule must have one or more hydrogen atoms covalently bonded to an atom with an electronegativity of 30 or greater N O F or Cl Please note this covalent bond between the H atom and N O F or Cl is NOT the hydrogen bond The strong polarity of the bond between H and the highly electronegative    See Answer
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