Kjeldahl's method was used for the estimation of nitrogen in an organic compound. The ammonia evolved from 0 . 55 g of the compound neutralised 12 . 5 mL of 1 M H 2 SO 4 solution. The percentage of nitrogen in the compound is (Nearest integer)

Step-by-step solution

Meq of H 2 SO 4 used by NH 3 = 12 . 5 × 1 × 2 = 25 % of N in the compound = 25 × 10 - 3 × 14 × 100 0 . 55 = 63 . 6 or Meq. of H 2 SO 4 = Meq. of NH 3 12 . 5 × 1 × 2 = 25 meq of NH 3 = 25 millimoles of NH 3 So Millimoles of N ' ' = 25 Moles of N ' ' = 25 × 10 - 3 wt. of N = 14 × 25 × 10 - 3 %   N = 14 × 25 × 10 - 3 0 . 55 × 100 = 63 . 66 ≈ 64 %