JEE MAIN - Chemistry (2022 - 26th July Evening Shift - No. 19)
A $$100 \mathrm{~mL}$$ solution of $$\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{MgBr}$$ on treatment with methanol produces $$2.24 \mathrm{~mL}$$ of a gas at STP. The weight of gas produced is _____________ mg. [nearest integer]
Answer
3
Explanation
$$\mathrm{CH}_{3}-\mathrm{CH}_{2}-\mathrm{MgBr}+\mathrm{CH}_{3} \mathrm{OH} \rightarrow \mathrm{CH}_{3}-\mathrm{CH}_{3}+\operatorname{MgBr}\left(\mathrm{OCH}_{3}\right)$$
As $$2.24 \,\mathrm{ml}$$ is formed at STP.
Number of moles of ethane gas produced
$$ =\frac{2.24 X}{22.4} $$
$$=10^{-4}\, \mathrm{ml}$$
Mass of ethane produced $$=10^{-4} \times 30=3 \times 10^{-}=3\mathrm{mg}$$
As $$2.24 \,\mathrm{ml}$$ is formed at STP.
Number of moles of ethane gas produced
$$ =\frac{2.24 X}{22.4} $$
$$=10^{-4}\, \mathrm{ml}$$
Mass of ethane produced $$=10^{-4} \times 30=3 \times 10^{-}=3\mathrm{mg}$$
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