30. From a sample of benzalidin weighing 0.8842 g, ammonia was distilled into a flask containing 50 ml of 0.05 M H2SO4. For titration of excess acid, 18.05 ml of NaOH T (0.004020 g/ml) were used. Calculate the mass fraction of nitrogen and the main component C6H5NHCOC6H5 (M=197.24 g/mol) in the sample.

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