Question

While estimating the nitrogen present in an organic compound by Kjeldahl's method, the ammonia evolved from 0.25 g of the compound neutralized 2.5 mL of 2 M H2SO4. The percentage of nitrogen present in organic compound is ________

Answer 1

** ** NH3 gas is neutralized by 2⋅5 mL of 2 M H2SO4
∴ Moles of NH3 neutralized = 2⋅5 × 2 × 2 millimole
= 10×10–3 moles
∴ Weight of N present in compound will be
= 10 × 10–3× 14
= 0⋅14 g
% of ‘N’ in compound
=$\frac{0.14}{0.25}$×100=56%