Please explain how you got answer. Thank you. Urea is an organic compound widely

Question

Please explain how you got answer. Thank you.

Urea is an organic compound widely used as a fertilizer. Its solubility in water allows it to be made into aqueous fertilizer solutions and applied to crops in a spray. What is the maximum theoretical number of water molecules that one urea molecule can hydrogen bond with? (Ignore shape for the purposes of this answer.) Urea could theoretically form hydrogen bonds with this number of water molecules. (Note, however, that the size and shape of a molecule may limit the number of hydrogen bonds formed by one urea molecule.)

Explanation / Answer

Each lone pair in urea can form a hydrogen bond to the H atom of a water molecule

Each H atom in urea can form a hydrogen bond to the lone pair on the O atom of a water molecule


Since urea has 4 lone pairs and 4 H atoms

=> maximum number of water molecules that can hydrogen bond

= 4 + 4

= 8 water molecules

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