Chemical Engineering - Stoichiometry - Discussion

29. 

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)

[A]. 80%
[B]. 90%
[C]. 95%
[D]. 98%

Answer: Option B

Explanation:

No answer description available for this question.

Idrees said: (Aug 25, 2014)  
60 grams of urea = 2*14 grams of nitrogen.
? = 42 grams of nitrogen.

Actual content of urea is = 60*42/28=90.

Assume total content is 100.

Tamilselvan said: (Feb 14, 2015)  
Mol wt of urea = 60.

So 60 gm of urea contains 28 gm of nitrogen.

So % of nitrogen in 100% urea = 28/60*100.

100% urea contains 46.67% of Nitrogen.

Actual % of nitrogen is 42%.

So % of urea = 42/46.67*100.

= 90%.

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