C8H9NO2 + C8H9NO2: Forces of Attraction

If two molecules of acetaminophen were to bond, there would be three major forces of attraction that would be able to bond them: London Dispersion Forces, Dipole- Dipole, and Hydrogen Bonding.  London Dispersion Forces are the temporary poles created by the constant motion of electrons, which causes any and every molecule to be temporarily polar.  Because molecules become temporarily polar, the negatives and positivies slightly attract.  Dipole- Dipole is a type of bond that forms between two polar molecules, which are also known as dipoles.  Because acetaminophen is a dipole, the positive end (the side with the carbon chain) of the first molecule is attracted to the negative end (the side with the nitrogen atom) of the second molecule of acetaminophen.  Thirdly, Hydrogen Bonding bonds is yet another way two molecules of acetaminophen can bond.  Hydrogen Bonds occur between a positively charged hydrogen atom and a negatively charged oxygen, nitrogen, or fluorine atom.  In the case of two molecules of acetaminophen, there can be hydrogen bonds beween an of the hydrogen atoms and either of the oxygen atoms.

Example of Hydrogen Bonding: