A flask of one litre capacity containing NH3 at 1 atm and 25oC. A spark is passed through until all the NH3 is decomposed into N2 and H2. Calculate the pressure (in atm) of gases left at 25oC.
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Solution
The given reaction is 2NH2→N2+3H2
For NH3:P=1atm,V=1litre,T=298K
mole of NH3=PVRT=1×10.0821×298
=4.087×10−2
Since, 2 mole of NH3 are used and 4 mole of N2 and H2 are formed.