For the reaction   2NH3(g)↽−−⇀3H2(g)+N2(g) the equilibrium concentrations were found to be [NH3]=0.250 M, [H2]=0.600 M, and [N2]=0.750 M. What is the equilibrium constant for this reaction?

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A: Given:Equilibrium concentrations:     [NH3]=0.250 M     [H2]=0.330 M     [N2]=0.750 M