Which of the following expressions is the correct equilibrium-constant expression for the equilibrium between dinitrogen tetroxide and nitrogen dioxide? N204 (8) 2NO2 (g) [NO21 1) IN2041 2) INO₂P² [N204] [NO21 3) IN204 5) [NO2][N2O4] _ of the reaction. The equilibrium-constant expression depends on the 1) stoichiometry 2) mechanism 3) stoichiometry and mechanism 4) the quantities of reactants and products initially present 5) temperature The Keq for the equilibrium below is 5.4 × 1013 at 480.0 °C. 2NO (g) + O2 (g) 2NO2 (g) What is the value of Keq at this temperature for the following reaction? 2NO2 (g) 2NO (g) + O2 (g) 1) 5.4 × 10-13 2) 1.9 x 10-14 3) 5.4 x 1013 4) 5.66 × 10-3 5) none of the above The equilibrium constant for the gas phase reaction 2503 (g) 25O2 (g) + O2 (g) is Keq = 3.6 x 103 at 999 K. At equilibrium, 1) products predominate 2) reactants predominate 3) roughly equal amounts of products and reactants are present 4) only products are present 5) only reactants are present