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Q.

29.5 mg of an organic compound containing nitrogen was digested according to Kjeldahl’s method and the evolved ammonia was absorbed in 20mL of 0.1 M HCl  solution. The excess of the acid required 15mL of 0.1 M NaOH  solution for complete neutralization. The percentage of nitrogen in the compound is

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a

59.0

b

47.4

c

23.7

d

29.5

answer is C.

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Detailed Solution

Weight of organic compound =29.5  mg NH 3+HCl→NH 4Cl HCl(remaining+NaOH15×0.1M=1.5  m  mol→NaCl+H 2O Total millimole of HCl=2 Millimole used by NH 3=2−1.5=0.5 Weight of NH 3=0.5×17mg=8.5  mg Wight of nitrogen =1417×8.5mg=7mg %  Nitrogen=729.5×100=23.7%
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