Chapter 17, Problem 121CP

. Suppose that for a hypothetical reaction:
${\text{A}}_{\text{2}}\left(g\right)+\text{2B}\left(g\right)\rightleftharpoons \text{2AB}\left(g\right)$   It is determined that at a certain temperature the equilibrium concentrations are: $\left[{\text{A}}_2\right]=0.0090,\left[\text{B}\right]=0.940$, and $\left[\text{AB}\right]=5.3\times {10}^{-4}$. Calculate the numerical value of K for the reaction.