A sample of organic material weighing 1.058 g is decomposed by the Kjeldahl method. The ammonia is distilled into 50.0 mL of0.100 M HCl solution. The excess remaining acid required 10.10 mL of0.098 M NaOH solution. The percentage of nitrogen in the sample would be

A sample of organic material weighing 1.058 g is decomposed by the Kjeldahl method. The ammonia is distilled into 50.0 mL of0.100 M HCl solution. The excess remaining acid required 10.10 mL of0.098 M NaOH solution. The percentage of nitrogen in the sample would be

  1. A

    5.45%

  2. B

    10.90%

  3. C

    12.4%

  4. D

    16.7%

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    Solution:

    Amount of HCl to start with  =50.0×103L0.10molL=50.0×104mol

    Amount of excess HCl HCl=10.0×103L0.098molL=9.8×104mol

    Amount of NH3 evolved or amount of N in the compound  =(50.09.8)×104mol=41.2×104mol

    Mass of N in the compound =41.2×104mol14gmol1=0.05768g

    Percentage of N in the compound =0.057681.058×100=5.45%

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