The number of moles of CuO that will be utili | vedclass

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(C) The molecular formula of $N,N$-dimethylaminopentane is $C_7H_{17}N$. The molar mass is $(7 	imes 12) + (17 	imes 1) + 14 = 84 + 17 + 14 = 115 \

Vedclass · Accepted Answer

$1125$

Vedclass · Answer

(C) The molecular formula of $N,N$-dimethylaminopentane is $C_7H_{17}N$. The molar mass is $(7 	imes 12) + (17 	imes 1) + 14 = 84 + 17 + 14 = 115 \ g/mol$. Moles of $N,N$-dimethylaminopentane $= \frac{57.5 \ g}{115 \ g/mol} = 0.5 \ mol$. The combustion reaction in the Dumas method is: $C_7H_{17}N + \frac{45}{2} CuO ightarrow 7 CO_2 + \frac{17}{2} H_2O + \frac{1}{2} N_2 + \frac{45}{2} Cu$. From the stoichiometry,$1 \ mol$ of $C_7H_{17}N$ requires $\frac{45}{2} = 22.5 \ mol$ of $CuO$. Therefore,$0.5 \ mol$ of $C_7H_{17}N$ requires $0.5 	imes 22.5 = 11.25 \ mol$ of $CuO$. $11.25 \ mol = 1125 	imes 10^{-2} \ mol$. The nearest integer is $1125$.

The number of moles of $CuO$ that will be utilized in the Dumas method for the estimation of nitrogen in a sample of $57.5 \ g$ of $N,N$-dimethylaminopentane is $..... \times 10^{-2}$. (Nearest integer)

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