In Duma’s method of estimation of nitrogen, 0.55 g of an organic compound gave 60 mL of nitrogen collected at 300 K temperature and 715 mm pressure. The percentage composition of nitrogen in the compound would be:
(aq. tension at 300 K = 15 mm)
A
11.4%
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B
4.6%
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C
18.6%
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D
25%
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Solution
The correct option is A11.4% Volume of N2 at STP
(By gas equation):
p1×V1T1=p2×V2T2
Here p1=ρ−ρ1ρ=715mm(pressure at which N2 collected) ρ1=aqueous tension of water =15mm
V2=(ρ−ρ1)×V1T1×273760 V1=60mL volume of moist nitrogen in nitro meter p2=1atm=760mmT2=0∘C=273K