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


A

59.0

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B

47.4

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C

23.7

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D

29.5

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Solution

The correct option is C

23.7


Explanation for correct answer:-

Option (C) 23.7

Step 1: Given data

Volume of HCl=20ml

Volume of NaOH=15ml

Step 2: Formula used :

Moles of HCl reacting with ammonia = (molesofHClabsorbed)(molesofNaOHsolutionrequired) ---------------------(1)

Step 3: Calculation of Moles of HCl

From eq (1) = (20x0.1x10-3)(15x0.1x10-3)

This will be equal to Moles ofNH3evolved which in turn gives moles of nitrogen in an organic compound.

Step 4: Calculating the weight of Nitrogen

Hence,

Weight of nitrogen in organic compound = 0.5x10-3x14.

We get,

=7x10-3g.

Step 5:Deriving Percentage of nitrogen

Percentage of nitrogen = (7x10-3)/(29.5x10-3)x100

=23.7%

Therefore, the percentage of nitrogen in the compound is23.7%

So, the correct option is (C).


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