For the reaction 2H2O(g)↽−−⇀ 2H2(g)+O2(g) 2H2O(g)↽−−⇀ 2H2(g)+O2(g) the equilibrium concentrations were found to be [H2O]=0.250 M[H2O]=0.250 M , [H2]=0.470 M[H2]=0.470 M , and [O2]=0.800 M[O2]=0.800 M . What is the equilibrium constant for this reaction?