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Question

A flask of capacity 1 L contains NH3 at 1 atm and 25C. A spark is passed through until all the NH3 is decomposed to N2 and H2. Calculate the pressure (in atm) of gases left at 25C
after the reaction.

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Solution

2NH3N2+3H2
No. of moles after reaction (n2)=2× no. of moles before reaction (n1)
at same T and V,Pn
P1P2=n1n2
1P2 = 12
Hence pressure after reaction = 2 atm

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