The ammonia evolved from 2 g of a compound in Kjeldahl’s estimation of nitrogen neutralizes 10 mL of 2 M H_2S0_4 solution. The weight percentage o f nitrogen in the compound is

KVPY SA Exam 2014 Question Paper

Question : 72 of 80

Marks: +1, -0

The ammonia evolved from 2 g of a compound in Kjeldahl’s estimation of nitrogen neutralizes 10 mL of 2 M H

_2

_4

solution. The weight percentage o f nitrogen in the compound is

Solution:

W_{\NH_3 }={17 × 4×10}/1000g

and

W_N = 14/17×{17 × 4×10}/1000

=0.56 g

%\ N =0.56/2×100=28%

2 NH_3 + H_2SO_4\ {– –––▸} (NH_4)_2 SO_4

Eq. of

H_2SO_4

= Eq. of NH

_3

Eq. of NH

_3 = 10 × 2 × 2 × 10^{–3}

= No. of mole of ammonia (n

_\factor = 1

)

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