Evaluating a Reaction Quotient Q.2. Gaseous nitrogen dioxide forms dinitrogen tetroxide according to this equation: 2NO2(g)=N204(g) When 0.10 mol NO2 is added to a 1.0-L flask at 25 °C, the concentration changes so that at equilibrium, [NO2] = 0.016 M and [N2O4] = 0.042 M. (a) What is the value of the reaction quotient before any reaction occurs? (b) What is the value of the equilibrium constant for the reaction?

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