The equilibrium system N2O4 (g) 2NO2 (g) was established in a 1.00-liter vessel. Upon analysis, the following information was found: [NO2] = 0.500 M; [N2O4] = 0.0250 M. What is the value of Keq?

a. 20.

b. 0.050

c. 10.0

d. 0.10

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