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Question

When N2O5 is heated at certain temperature, it dissociates as
N2O5(g)N2O3(g)+O2(g);Kc=2.5. At the same time N2O3 also decomposes as:
N2O3(g)N2O+O2(g). If initially 4.0 moles of N2O5 are taken in 1.0 litre flask and allowed to dissociation, concentration of O2 at equilibrium is 2.5M.


Equilibrium concentration of N2O5 is:

A
1.0M
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B
1.5M
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C
2.166M
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D
1.834M
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Solution

The correct option is A 1.834M
N2O3N2O5+O2
4x xy x+y
N2O3N2OO2
xy N2O y+x
[O2]=x+y=2.5 and 2.5
=(x+y)(xy)4x
x=2.166
[N2O5]=4x=1.846

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