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Q.

In Kjeldahl’s estimation of nitrogen, the ammonia evolved from $0. 5g$ of an organic compound neutralized $10 ml$ of $1M$ $H_{2} {SO}_{4}$ . Calculate the percentage of nitrogen in the compound.

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answer is 56.

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Detailed Solution

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10ml of ${1M H}_{2} {SO}_{4} = 20 ml$ of M ${NH}_{3}$ .

1000 of 1M ammonia contains $14gr$ Nitrogen

20ml of 1M ammonia contains $\frac{14 \times 20}{1000} g r$ $N_{2}$

% of Nitrogen $= \frac{14 \times 20 \times 100}{1000 \times 0.5} = 56.0 %$

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In Kjeldahl’s estimation of nitrogen, the ammonia evolved from 0.5g of an organic compound neutralized 10ml of 1M H2SO4 . Calculate the percentage of nitrogen in the compound.