Q8 / 71 · NTA Abhyas (JEE Main) 2020 · Chemistry · Amines

0.4 g of an organic compound on Kjeldahl’s analysis gave enough ammonia to just neutralize 20 ml of 1N  H 2 SO 4 . What is the percentage of nitrogen in the compound?

Correct answer: 70

Solution

milli equivalents of NH 3 = milli equivalents of H 2 SO 4
milli moles of NH 3 ×1=1 N×20 ml
milli moles of NH 3  = 20 milli moles
∴ mass of N= 2 0 ×14 100 0
=0.28
∴ % of N= 0.28 0.4 ×100=70%

Hence, the correct answer is 70.

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