69. When the reaction below is at equilibrium, what is the temperature?2 NO(g) + O2(g) → 2 NO2(g) H   rxn = –113 kJ•mol–1S°rxn = –145 J•mol–1•K–1
(A) –195 °C
(B) 77.9 °C
(C) 350.9 °C
(D) 506 °C
(E) 779 °C