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Hey Claire, one urea molecule can form 8 different hydrogen bonds with water molecules because the partially charged oxygen atoms in the water molecules can form hydrogen bonds with the 4 partially charged hydrogen atoms on the urea molecule (the N-H branches), and the partially charged hydrogen atoms on the water molecules can form hydrogen bonds with the 2 nitrogen atoms in urea as well as the 2 lone pairs on the single oxygen atom in the urea molecule. Adding these up, urea can potentially form 8 hydrogen bonds with water.
The number is 8 because, since Hydrogen bonds occur with N,O, and F atoms, the Oxygen can bond with 2 water molecules, the 4 Hydrogens can each bond with one water molecule, and each Nitrogen can bond with one molecule so if you add up all of those bonds you get 8.
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