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  • 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 <img alt="12.5 \mathrm{~mL} \text { of } 1 \ma

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 \mathrm{~mL} \text { of } 1 \mathrm{M} \mathrm{~H}_{2} \mathrm{SO}_{4} solution.

The percentage of nitrogen in the compound is ___________.(Nearest integer)

Option: 1

64


Option: 2

-


Option: 3

-


Option: 4

-


Answers (1)

best_answer

\mathrm{\text { meq of } \mathrm{H}_{2} \mathrm{SO}_{4}=25}

\mathrm{\therefore meq \: of \: \mathrm{NH}_{3}=25= m\: moles\: of \: \mathrm{NH}_{3}}\\

                                      \mathrm{= m\: moles\: of \: N}

\therefore \text { mass of N }=25 \times 10^{-3} \times 14 \\

                            =0.35

\therefore \% \text { by weight of N} =\frac{0.35}{0.55} \times 100 \\

                                        =63.6 \%

Hence answer is 64

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Gunjita

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