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A 0 . 166   g sample of an organic compound was digested with conc. H 2 SO 4 and then distilled with NaOH . The ammonia gas evolved was passed through 50 . 0   mL of 0 . 5   N   H 2 SO 4 . The used acid required 30 . 0   mL of 0 . 25   N   NaOH for complete neutralization. The mass percentage of nitrogen in the organic compound is

Correct answer

63

Step-by-step solution

Complete acid is not used in the reaction. Milli eq. of NH 3 = milli eq. of NaOH = 0 . 25 × 30 = 7 . 5   Millimole of Nitrogen = 7 . 5 W Nitrogen = 7 . 5 × 14 × 10 - 3 = 0 . 105   gram % of Nitrogen = 0 . 105 0 . 166 × 100 = 63 . 25 = 63

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