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For the reaction below (an undesired side reaction in the industrial production of nitric acid), if...

For the reaction below (an undesired side reaction in the industrial production of nitric acid), if you begin by adding 0.0150 moles of both NH3 and O2 to a 1.00 L reaction vessel, and once equilibrium is established you have a nitrogen concentration of 0.00196 M, what is the value for Kc?

4 NH3 (g)   + 3 O2 (g)   <-->   2 N2 (g) +   6 H2O (g)

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