For the reaction , the equilibrium constant at . In a flask, the instantaneous molar concentrations — Chemical Equilibrium Chemistry Question

Question

For the reaction $H_2(g) + I_2(g) \rightleftharpoons 2HI(g)$, the equilibrium constant $K_c = 57.0$ at $700\text{ K}$. In a flask, the instantaneous molar concentrations are $[H_2] = 0.10\text{ M}$, $[I_2] = 0.20\text{ M}$, and $[HI] = 0.40\text{ M}$. Calculate the exact numerical value of the reaction quotient $Q_c$.