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### $N{H_2} - CO - N{H_2}\xrightarrow{NaOBr} {N_2}$

Hydrazine formed from Urea is further oxidised to $N_2$ as shown below:

$N{H_2} - \mathop {\mathop C\limits^\parallel }\limits^O - N{H_2} \xrightarrow[\text{Hoffmann Bromamide Degradation}]{\text{NaOBr}} N{H_2} - N{H_2} \longrightarrow {N_2}$

Assuming 1 dL of blood sample contains 30 mg of Urea, calculate the volume of $N_2$ gas obtained at NTP from the sample.

Solution

From the reaction, 1 mol of Urea liberates 22.4 L $N_2$ at NTP

Or, 60 gm Urea liberates 22.4 L $N_2$ at NTP

Or, 1 gm Urea liberates $\frac {22.4}{60}$ L $N_2$ at NTP

Or, 30 mg Urea liberates $\frac{{22.4}}{{60}} \times 30 \times {10^{ - 3}}$ L $N_2$ at NTP

= $1.12 \times 10^{-2}$ L $N_2$ at NTP

### Sum of the coefficients in the expansion of $(x+y)^n$ ....

If the sum of the coefficients in the expansion of $(x+y)^n$ is 4096, then the greatest coefficient in the expansion is _ _ _ _ . Solution $C_0 + C_1 + C_2 + C_3 + ......................... + C_n =4096$ $\therefore 2^n = 4096 =2^{12}$ $\Rightarrow n = 12$ Greatest coefficient = ${}^{12}{C_6} = 924$