Question

HELPPPP
molecule of formaldehyde CHCl3, has the same shape of a molecule of methane, CH4. However, methane’s boiling point is -164 °C and formaldehyde’s boiling point is 62 °C. Explain the difference between the two boiling points.

Answer 1

4. Consider the kinds of intermolecular forces present

in the following compounds, and rank the substances

in likely order of increasing boiling point.

H2S (34 amu)

C2H6

(30 amu, C—C bond length 154 pm)

CH3OH (32 amu)

Ar (40 amu, radius 71 pm)

Answer 2

Answer:

In general, larger molecules have higher boiling points than smaller molecules of the same kind, indicating that dispersion forces increase with mass, number of electrons, number of atoms or some combination thereof.