Final answer:
The structural formula of urea is NH2C(O)NH2, which includes a carbon atom double-bonded to an oxygen and two amine groups. The carbon atom is sp2 hybridized.
Step-by-step explanation:
The structural formula of urea is NH2C(O)NH2. It consists of a carbon atom double-bonded to an oxygen atom (C=O) and two amine groups (-NH2). This molecule is commonly used as a nitrogen source in fertilizers. Regarding the hybridization of the carbon atom in urea, it takes on an sp2 configuration due to the formation of three sigma bonds by overlapping with one oxygen atom and two nitrogen atoms, and one pie bond with the oxygen atom.