HSC - রসায়ন ২য় পত্র→অধ্যায়-০৩ঃ পরিমাণগত রসায়ন→All Topics

During determination of nitrogen by Kjeldahl method, it is seen that evolved $\mathrm {NH_3}$ from $\text {3.51 gm}$ aniline can be neutralized by $\mathrm {3.69 ~cm^3}$ of $\text {0.0103 M HCl.}$ The percentage of nitrogen in aniline is-