The percentage of nitrogen in urea is________________?
Correct answer: B. 46%
- A. 36%
- B. 46%
- C. 56%
- D. 66%
Explanation
Urea has formula CO(NH2)2, so its molar mass is 12 + 16 + 2(14) + 4(1) = 60 g mol^-1. Nitrogen contributes 28 g mol^-1, therefore percentage nitrogen = (28 g mol^-1 / 60 g mol^-1) x 100 = 46.7%, approximately 46%. The common trap is 36%, which results from using an incorrect molar mass or nitrogen contribution.
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Polymers are large molecules made from repeating monomer units joined by covalent bonds. The topic distinguishes addition polymers such as polyethylene, PVC and polystyrene from condensation polymers such as nylon and polyester, and relates chain structure to thermoplastics, thermosetting polymers, elastomers, properties, uses and environmental concerns.
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