Amount of N2=0.50 mol,O2=0.50 mol, and NO=0.020 mol in a 1 litre flask.
And,Concentration is amount of solute in 1 litre of solution.
Therefore,[N2]=0.5 mol/l;[O2]=0.5 mol/l ;[NO]=0.020 mol/l
For the given reaction,N2(g)+O2(g)←→2NO(g)
Keq=[N2][O2][NO]2=0.5×0.5(0.020)2=0.080
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