The equilibrium constant for the reaction N 2 ( g ) + O 2 ( g ) ⇌ 2 NO ( g ) is expressed as K c = [ N 2 ] [ O 2 ] [ NO ] 2 . To find the value of K c , measure the equilibrium concentrations of the reactants and products and substitute them into the expression. The reaction is significant in various chemical processes and was discovered by Joseph Louis Gay-Lussac.
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K c = [ N 2 ] [ O 2 ] [ NO ] 2 ;