A \( 0.166\ \mathrm{g} \) sample of an organic compound was digested with conc. \( \mathrm{H_2SO_4} \) and then distilled with \( \mathrm{NaOH} \). The ammonia gas evolved was passed through \( 50.0\ \mathrm{mL} \) of \( 0.5\ \mathrm{N} \) \( \mathrm{H_2SO_4} \). The used acid required \( 30.0\ \mathrm{mL} \) of \( 0.25\ \mathrm{N} \) \( \mathrm{NaOH} \) for complete neutralization. The mass percentage of nitrogen in the organic compound is ________________.
