We are being asked to calculate the equilibrium constant, Kc for the given equilibrium reaction:
2 NO2(g) ⇌ 2 NO(g) + O2(g)
When dealing with equilibrium and Kc:
• Kc → equilibrium units are in molarity
• Kc is an equilibrium expression:
▪ only aqueous and gaseous species are included in the equilibrium expression
▪ the coefficient of each compound in the reaction equation will be the exponent of the concentrations in the equilibrium expression
A 1.00 liter flask contained 0.24 mol NO2 at 700 K which decomposed according to the reaction 2 NO2(g) ⇌ 2NO(g) + O2(g). Determine Kc given that when equilibrium was achieved, 0.14 mol NO was present.