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)=