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The number of moles of CuO, that will be utilized in Dumas method for estimation of nitrogen in a sample of 230 gm of N,N- dimethyl amino pentane is ………

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11.25

22.5

answer is C.

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Detailed Solution

Moles of N in N, N-dimethylaminopentane $= \frac{230}{115} = 2 m o l e s$

$\Rightarrow C_{7} H_{17} N + \frac{45}{2} C u O \to 7 C O_{2} + \frac{17}{2} H_{2} O + \frac{1}{2} N_{2} + \frac{45}{2} C u$

For (0.5) moles of number of moles of CuO required $= 2 \times \frac{45}{2} = 45$

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