For the reaction n2+o2-->2no equilibrium constant=2
degree of association is

Dear Student
 In the above reaction number of moles at equilibrium of
N2 = (1-a)
O2 = (1-a) and 
NO = 2a
​where a is the degree of dissociation
So equilibrium constant(k)= (2a)2/(1-a)2
  As a<<1 so
k=4a2
​a2 = k/4 =2/4  as k=2
a=.5
So degree of dissociation is .5.



Regards

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