Where, \(\mathrm{p}_{2}=\) pressure of \(\mathrm{N}_{2}\) at \(\mathrm{STP}=760\, \mathrm{mm}\)

\(\mathrm{T}_{2}=\) Temperature of \(\mathrm{N}_{2}\) at \(\mathrm{STP}=273\, \mathrm{K}\)

\(V_{2}=?\)

Volume of \(\mathrm{N}_{2}\) at \(\mathrm{STP}\) (by Gas equation)

\(\left(\frac{\rho-\rho_{1}}{t+273}\right) V_{1} \times \frac{273}{160}=V_{2}\)

Where \(\mathrm{p}_{1}=\rho-\rho_{1}\)

\(\rho=715\, \mathrm{mm}\) (pressure at which \(\mathrm{N}_{2}\) collected)

\(\rho_{1}=\) aqueous tension of water \(=15\, \mathrm{mm}\)

\(T_{1}=t+273=300\, k\)

\(\mathrm{V}_{1}=55\, \mathrm{mL}=\) volume of moist nitrogen in nitrometer \(\therefore V_{2}=\frac{(715-15) \times 55}{300} \times \frac{273}{760}=40.098\, \mathrm{mL}\)

\(\%\) of nitrogen in given compound

\(=\frac{28}{22400} \times \frac{V_{2}}{W} \times 100\)

\(=\frac{2}{22400} \times \frac{46.09}{0.35} \times 100\)

\(=16.45 \%\)