N2 content in a urea sample was found to be only 42%. What is the actual urea content of the sample? (Molecular weight of urea = 60) ?
Correct answer: B. 90%
- A. 80%
- B. 90%
- C. 95%
- D. 98%
Explanation
Pure urea contains 28/60 = 46.67% nitrogen by mass. Thus a sample containing 42% nitrogen has urea purity equal to 42/46.67 × 100 = 90%.
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