29.5 mg of an organic compound containing nitrogen was digested according to Kjeldahl's method and the evolved ammonia was absorbed in 20 mL of 0.1M HCl solution. The excess of the acid required 15 mL of 0.1 M NaOH solution for complete neutralization. The percentage of nitrogen in the compound is
Explanation for correct answer:-
Option (C)
Step 1: Given data
Volume of
Volume of
Step 2: Formula used :
Moles of
Step 3: Calculation of Moles of
From eq (1) =
This will be equal to Moles of
Step 4: Calculating the weight of Nitrogen
Hence,
Weight of nitrogen in organic compound =
We get,
Step 5:Deriving Percentage of nitrogen
Percentage of nitrogen =
Therefore, the percentage of nitrogen in the compound is
So, the correct option is (C).