Hydrogen Halides 2

Chemistry Level pending

At standard temperature and pressure (STP), H F \ce{HF} is a liquid whereas H C l \ce{HCl} , H B r \ce{HBr} , and H I \ce{HI} are all gases. Which of the following best accounts for this observation?

H F \ce{HF} has weaker dispersion forces than any of H C l \ce{HCl} , H B r \ce{HBr} , or H I \ce{HI} . H F \ce{HF} has the smallest dipole moment of H C l \ce{HCl} , H B r \ce{HBr} , and H I \ce{HI} . H F \ce{HF} has a higher vapor pressure than any of H C l \ce{HCl} , H B r \ce{HBr} , or H I \ce{HI} . H F \ce{HF} has the greatest density of H C l \ce{HCl} , H B r \ce{HBr} , and H I \ce{HI} . H F \ce{HF} has hydrogen bonding but H C l \ce{HCl} , H B r \ce{HBr} , and H I \ce{HI} do not.

James Dohm by James Dohm , 23, USA

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1 solution

James Dohm
Jul 19, 2016

The fluorine atom is so electronegative that the strong dipole forces (hydrogen bonding) exhibited by H F \ce{HF} outweigh its relatively low dispersion forces. As a result, H F \ce{HF} has the highest boiling point of any of the hydrogen halides because it has the strongest intermolecular forces.

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Why HCL doesnt make hydrogen bond?

Mr Yovan - 4 years, 10 months ago

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