A 0.166 g sample of an organic compound was digested with conc. H₂SO₄ and then distilled
with NaOH. The ammonia gas evolved was passed through 50.0 mL of 0.5 N H₂SO₄. The
 acid used for ammonia if neutralised requires 30.0 mL of 0.25 N NaOH for complete neutralization. The mass percentage
of nitrogen in the organic compound is____.