Consider the following elementary reaction: no2(g) + f2(g) --> no2f(g) + f (g) suppose we let k1 stand for the rate constant of this reaction, and k -1 stand for the rate constant of the reverse reaction. write an expression that gives the equilibrium concentration of f2 in terms of k1, k -1, and the equilibrium concentrations of no2, no2f, and f.