Do we have to experimentally determine all of the concentrations in order to calculate K?

In an experiment starting with [N2O4]o = 0.0200 M and [NO2]o = 0.0000 M, [N2O4]eq was found to be 0.00452 M.

A. What is [NO2]eq?

B. What is the numerical value of Kc for the reaction

N2O4(g) = 2NO2 (g)?

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