Molecule Boiling Point of C ompound Dipole Moment Polarizability HCI HBr HI deby

Question

Molecule Boiling Point of C ompound Dipole Moment Polarizability HCI HBr HI debyes) (10-24 em 188 207 238 1.05 0.80 0.38 2.63 3.61 5.44 4. The boiling points, dipole moments, and polarizabilities of three hydrogen sHD (a) Based on the data in the table, what type of intermolecular force among halides are given in the table above. HI(D is able to account for the trend in boiling points? Justify your (b) Based on the data in the table, a student predicts that the boiling point of HF should be 174 K. The observed terms of the types and boiling point of HF is 293 K. Explain the failure of the student's prediction i strengths of the intermolecular forces that exist among HF molecules. (c) A representation of five molecules of HBr in the liquid state is s hown in box 1 below, In box 2, draw a has occurred. representation of the five molecules of HBr after complete vaporization Box 2 Box 1

Explanation / Answer

(a)

There exists dipole - dipole interactions among the moleucles of HCl, HBr and HI. As we go down the group the atomic weight of Cl, Br , I will increase gradually and hence the strength of interactions will also increase.

(b)

It is because of the presence of strong intermolecular hydrgoen bonding among HF molecuels which is not possible among the molecules of HCl, HBr and HI

(c)

In vapour state the distance between the molecules to be far apart.

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