JEE Mains Model Paper 9

Moles of HCl reading with ammonia
= (moles of HCl absorbed) − (moles of NaOH solution required)
= (20 × 0.1 × 10−3) − (15 × 0.1 × 10−3)
= moles of NH3 evolved.
= moles of nitrogen in organic compound
∴ wt. of nitrogen in org. comp
= 0.5 × 10−3 × 14
= 7 × 10−3 g
% wt =

7×10−3

29.5×10−3

= 23.7%