Q.

In Dumas' method of estimation of nitrogen 0.35 g of an organic compound gave 55 mL of nitrogen collected at300 K temperature and 7l5 firm pressure. The percentage composition of nitrogen in the compound would be : (Aqueous tension at 300 K - l5 mm) 

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a

14.45

b

15.45

c

16.45

d

17.45

answer is C.

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Detailed Solution

PN2=71515=700mm V=55mL  PV=wMRT 700760×551000=wN228×0.0821×300 wN2=0.058g  %N2=0.0580.35×100=16.45

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