Urea is the central monomer in the synthesis of urea-formaldehyde thermosetting resins. Consider the — Polymers Chemistry Question
Question
Urea is the central monomer in the synthesis of urea-formaldehyde thermosetting resins. Consider the Lewis structure of a single, unreacted molecule of urea ($NH_2CONH_2$). How many lone pairs of electrons are present on the heteroatoms (Nitrogen and Oxygen) combined?
Answer: 4
💡 Solution & Explanation
In the Lewis structure of urea, the central carbonyl oxygen ($=O$) has 2 lone pairs of electrons. Each of the two nitrogen atoms in the amine groups ($-NH_2$) has 1 lone pair of electrons. Total lone pairs = $2 (from O) + 1 (from N) + 1 (from N) = 4$.
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