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A sample of pure NO2 is heated to 336?C at which temperature it partially dissociates according...

A sample of pure NO2 is heated to 336?C at which temperature it partially dissociates according to the equation
2NO2(g)?2NO(g)+O2(g)
At equilibrium the density of the gas mixture is 0.525g/L at 0.755atm . Calculate Kc for the reaction. Thank you for your help!

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