question_answer

In Duma’s method for estimation of nitrogen, 0.25 g of an organic compound gave 40 mL of nitrogen collected at 300 K temperature and 725 mm pressure. If the aqueous tension at 300 K is 25 mm, the percentage of nitrogen in the compound is                               [NEET 2015 (C)]

A) 17. 36

B) 18.20

C) 16.76

D) 15.76

Correct Answer: C

Solution :

[c] Experimental values

According to Duma's method for estimation of N,

Weight of nitrogen

where, p is pressure = 700 mm

V of nitrogen = 40mL

M molecular mass of

& of nitrogen