Question

o2, h2o, c3h8, cf4. of the substances listed above, which has the highest boiling point, and why? a o2 because its molecules have a double bond between the oxygen atoms. b h2o because hydrogen bonds form between its molecules. c c3h8 because multiple hydrogen bonds can form between its molecules. d cf4 because its molecules have the largest dipole moment, since c - f bonds are highly polar.

Explanation:

Hydrogen bonds are a strong type of intermolecular force. Water ($H_2O$) molecules can form hydrogen bonds with each other. $O_2$ has only weak London - dispersion forces due to its non - polarity. Propane ($C_3H_8$) is non - polar and has only London - dispersion forces. Carbon tetrafluoride ($CF_4$) is also non - polar and has only London - dispersion forces. Hydrogen bonds are stronger than London - dispersion forces, so substances with hydrogen bonding generally have higher boiling points.

Answer:

B. $H_2O$, because hydrogen bonds form between its molecules.