General Organic Chemistry Question 9
Question 9 - 2024 (01 Feb Shift 2)
Following Kjeldahl’s method, $1 g$ of organic compound released ammonia, that neutralised $10 mL$ of $2 MH _2 SO _4$. The percentage of nitrogen in the compound is _________ $%$.
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Answer (56)
Solution
Formula: Mole mole concept
$H _2 SO _4+2 NH _3 \rightarrow\left(NH _4\right) _2 SO _4$
Millimole of $H _2 SO _4 \rightarrow 10 \times 2$
So Millimole of $NH _3=20 \times 2=40$
Organic $\rightarrow NH _3$
Compound 40 Millimole
$\therefore$ Mole of $N=\frac{40}{1000}$
wt. of $N=\frac{40}{1000} \times 14$
$%$ composition of $N$ in organic compound
$=\frac{40 \times 14}{1000 \times 1} \times 100$
$=56 \%$
