Question

What has the lowest boiling point (H2O, Br2, HBr)?

Answer 1

Answer on Question #64257, Chemistry / Inorganic Chemistry

What has the lowest boiling point (H₂O, Br₂, HBr)?

Answer:

H₂O: 100 °C (hydrogen bonds)

Br₂: 59 °C (dispersion forces)

HBr: -66 °C (dipole-dipole forces)

Of the three compounds, HBr should have the lowest boiling point because it has the weakest IMFs (HBr is dipole-dipole). H₂O are hydrogen bonds with the oxygen, so it will be more difficult to separate the molecules into the gas phase. H₂O has the highest boiling point because it has the strongest/most IMFs. Br₂ is nonpolar compound and have dispersion force only.

$$\mathrm{HBr} < \mathrm{Br}_2 < \mathrm{H}_2\mathrm{O}$$

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