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Order of Reaction

A flask of ca...

Question

A flask of capacity 1 L contains $N H_{3}$ at 1 atm and $25^{\circ} C$ . A spark is passed through until all the $N H_{3}$ is decomposed to $N_{2}$ and $H_{2}$ . Calculate the pressure (in atm) of gases left at $25^{\circ} C$
after the reaction.

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Solution

$2 N H_{3} \to N_{2} + 3 H_{2}$
No. of moles after reaction $(n_{2}) = 2 \times$ no. of moles before reaction $(n_{1})$
at same $T$ and $V, P \propto n$
$∴ \frac{P_{1}}{P_{2}} = \frac{n_{1}}{n_{2}}$
$∴ \frac{1}{P_{2}}$ = $\frac{1}{2}$
Hence pressure after reaction = 2 atm

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Order of Reaction

Standard XII Chemistry

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