JEE MAIN - Chemistry (2024 - 4th April Morning Shift - No. 25)
$$\mathrm{Xg}$$ of ethylamine is subjected to reaction with $$\mathrm{NaNO}_2 / \mathrm{HCl}$$ followed by water; evolved dinitrogen gas which occupied $$2.24 \mathrm{~L}$$ volume at STP. X is _________ $$\times 10^{-1} \mathrm{~g}$$.
Answer
45
Explanation
Moles of $$\mathrm{N}_2=0.1$$
$$\begin{aligned} \text { Mass of } \mathrm{C}_2 \mathrm{H}_5 \mathrm{NH}_2 & =(0.1) \times 45 \\ & =4.5 \mathrm{~gm} \\ & =45 \times 10^{-1} \\ & =45 \end{aligned} $$
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