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QJEEM22Ch4f94: JEE Main 2022 Chemistry - Class 11 JEEM22Ch4f94 Solution: Kjeldahl's method was used for the estimation of nitrogen in an …

Kjeldahl's method was used for the estimation of nitrogen in an organic compound. The ammonia evolved from 0.55 g of the compound neutralised 12.5 mL of 1 M H2SO4 solution. The percentage of nitrogen in the compound is _____________. (Nearest integer)

Step-by-Step Verified Solution

Meq. of H2SO4=\mathrm{H}_2 \mathrm{SO}_4= Meq. of NH3\mathrm{NH}_3

12. 5×1×2=255 \times 1 \times 2=25 meq. of NH3\mathrm{NH}_3 =25=25 millimoles of NH3\mathrm{NH}_3

So Millimoles of ′N′=25{ }^{\prime} \mathrm{N}^{\prime}=25

Moles of N′=25×10−3\mathrm{N}^{\prime}=25 \times 10^{-3}

wt. of N=14×25×10−3N=14 \times 25 \times 10^{-3}

amp;% N=14×25×10−30.55×100amp;=63.66amp;≈64%\begin{aligned}& \% \mathrm{~N}=\frac{14 \times 25 \times 10^{-3}}{0.55} \times 100 \\\\& =63.66 \\\\& \approx 64 \%\end{aligned}

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