1
In Dumas method of estimation of nitrogen, 0.35 g of an organic compound gave 55 mL of nitrogen collected at 300 K temperature and 715 mm pressure. The percentage composition of nitrogen in the compound would be (aqueous tension at 300 K = 15 mm).
- 15.45
- 16.45
- 17.45
- 14.45
Answer
(2) 16.45
Solution
Pressure of dry N2 = 715 - 15 = 700 mm
Volume at STP: V0 = P1 V1T1 T0P0
= 700 55300 273760
= 46.1 mL
As per NCERT, % of nitrogen = 2822400 volume of N2 at STPmass of organic compound 100
= 28 46.1 10022400 0.35
= 16.46 16.45
Answer: (2)
Out of syllabusAIPMT 2011 (Prelims)