Dinitrogen tetraoxide decomposes to produce nitrogen dioxide. Calculate the equilibrium constant for the reaction given the equilibrium

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Dinitrogen tetraoxide decomposes to produce nitrogen dioxide. Calculate the equilibrium constant for the reaction given the equilibrium concentrations at 100 °C: [N2O4] = 0.800 and [NO2] = 0.400.

N2O4(g) ⇄ 2 NO2(g) 

(a) Keq = 0.200

(b) Keq = 0.500

(c) Keq = 0.625

(d) Keq = 2.00

(e) Keq = 5.00.

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