JEE Main | 2014Mole ConceptHard

Question

For the estimation of nitrogen, 1.4 g of an organic compound was digested by Kjeldahl method and the evolved ammonia was absorbed in 60 mL of sulphuric acid. The unreacted acid required 20 mL of sodium hydroxide for complete neutralization. The percentage of nitrogen in the compound is

Options

A.6 %
B.10 %
C.3 %
D.5 %

Solution

       
As per question
(ngeq)H2SO4 = (ngeq)NaOH + (ngeq)NH3
+ (ngeq)NH3
+ (ngeq)NH3
(ngeq)N =
(nmol)N = (nmol)NH3 = (ngeq)NH3 =
(Mass)N = = 0.14 g
Percentage of ″N″ = × 100 = 10%

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