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A 0.166 g sample of an organic compound ...

A 0.166 g sample of an organic compound was digested with conc. `H_2SO_4` and then distilled with NaOH. The ammonia gas evolved was passed through 50.0 mL of 0.5 N `H_2SO_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 ________

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