Which of the following expressions is the correct equilibrium-constant expressio

Question

Which of the following expressions is the correct equilibrium-constant expression for the equilibrium between dinitrogen tetroxide and nitrogen dioxide?
3N2O4(g) INCLUDEPICTURE "http://session.masteringchemistry.com/problemAsset/1801236/4/doublearrowshort.jpg" * MERGEFORMATINET 6NO2 (g)

[A] [N2O4] 6 /[NO2] 3 [B] [NO2] 6 /[N2O4] 3

[C] [NO2] 3 /[N2O4] 3 [D] [N2O4] 3 /[NO2] 3 [E] [NO2] 3 /[N2O4] 6

2. At equilibrium, ________

   [A] the rates of the forward and reverse reactions are equal

   [B] all chemical reactions have ceased

   [C] the rate constants of the forward and reverse reactions are equal

   [D] the value of the equilibrium constant is 1

   [E] the limiting reagent has been consumed

3. Which quantities are equal in a dynamic equilibrium?

   [A] the rates of the forward and reverse reactions

   [B] the rate constants of the forward and reverse reactions

   [C] the volumes of the reactants and products

   [D] the concentrations of the reactants and products

Explanation / Answer

1.3N2O4(g) <----> 6NO2(g)

Kc = [NO2]^6/[N2O4]^3

2. At equilibrium, ________

[A] the rates of the forward and reverse reactions are equal.

3.Which quantities are equal in a dynamic equilibrium_______

[B] the rate constants of the forward and reverse reactions

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