AIPMT 2011 Physics and Chemistry Solved Paper

In Duma's method of estimation of nitrogen :-
Calculation :- volume of N2 at NTP (By gas equation)
(‌

ρ−ρ1

t+273

)v×‌

273

760

=V‌ml
% of nitrogen in given compound
‌

28

22400

×‌

V

W

×100
Here, ‌‌W=0.35‌gm.
ρ=715‌mm (Pressure at which N2 collected)
ρ1= aqueous tension of water =15‌mm.
(t+273)K=300K
v‌ml= volume of moist nitrogen in nitrometer =55‌ml.
so volume of N2 at NTP =(V)=‌

(715−15)×55

300

×‌

273

760

=46.098‌ml.
% of nitrogen =‌

28

22400

×‌

46.098

0.35

×100=16.45%