MCQ
The number of moles of $\mathrm{CuO}$, that will be utilized in Dumas method for estimation nitrogen in a sample of $57.5 \,\mathrm{~g}$ of $\mathrm{N}, \mathrm{N}$-dimethylaminopentane is $.....\,\times 10^{-2} .$ (Nearest integer)
  • A
    $1963$
  • B
    $8510$
  • $1125$
  • D
    $7412$

Answer

Correct option: C.
$1125$
c
Moles of $\mathrm{N}$ in $\mathrm{N}, \mathrm{N}$ - dimethylaminopentane

$=\left(\frac{57.5}{115}\right)=0.5\, \mathrm{~mol}$

$\Rightarrow \mathrm{C}_{7} \mathrm{H}_{17} \mathrm{~N}+\frac{45}{2} \mathrm{CuO} \rightarrow 7 \mathrm{CO}_{2}+\frac{17}{2} \mathrm{H}_{2} \mathrm{O}+\frac{1}{2} \mathrm{~N}_{2}+\frac{45}{2} \mathrm{Cu}$

$\frac{\mathrm{n}_{\mathrm{cuo}} \text { reacted }}{\left(\frac{45}{2}\right)}=\frac{\mathrm{n}_{\mathrm{C_7} \mathrm{H}_{17} \mathrm{N}} \text { reacted }}{1}$

$\Rightarrow \mathrm{n}_{\mathrm{C} \mathrm{u} O}$ reacted $=\left(\frac{45}{2}\right) \times 0.5=11.25$

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