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\( 0.5 g \) of an organic compound containing nitrogen on kjeldahlising required \( 29 m l \) of \( N / 5 H_{2} S O_{4} \) for complete neutralisation of ammonia. The percentage of nitrogen in the compound is :

1. 34.3
2. 16.2
3. 13.6
4. 24.5

Correct answer: 16.2

Solution

In Kjeldahl analysis, the ammonia formed neutralizes the acid in a 1:1 equivalent ratio. From the acid used, you can calculate the amount of nitrogen present and then express it as a percentage of the sample mass.

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