Consider the following reversible reaction, which is believed to proceed by a one-step ky k, mechanism in each direction:
2NO₂ ⇌ {k_f} _{kᵣ} N₂O₄
a. Write the rate expression for each direction.
b. At equilibrium, the net rat exactly equal to that of the reverse reaction. Set your two rate expressions equal to each other, and solve the equality for k_f/fᵣ. This ratio of constants is itself a constant, which we call the equilibrium constant, Kc.