68. From a sample of benzanilide weighing 0.8842 g, ammonia was distilled into a flask containing 50.00 ml of 0.05 M H2SO4 (K = 1.071). 18.05 ml of NaOH (Т(NaOH)=0.004020) was used for titration of excess acid. Calculate the mass fraction (%) of nitrogen and the main component C6H5NHCOC6H5 (M=197.24 g/mol) in the sample.

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