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An organic compound made of $\mathrm{C}, \mathrm{H}$ and $\mathrm{N}$ contains $20 \%$ nitrogen. Its molecular weight is :
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The correct answer is:
$70$
Nitrogen at. wt. $=14$ in a molecule minimum one atom of $\mathrm{N}$ is present
i.e., $\begin{array}{rlr}20 \% & \equiv 14 & \text { Molecular weight }=70 \\ 100 \% & \equiv 14 \times 5=70 & \end{array}$
i.e., $\begin{array}{rlr}20 \% & \equiv 14 & \text { Molecular weight }=70 \\ 100 \% & \equiv 14 \times 5=70 & \end{array}$
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