7. . Consider the formation of MgO( s) • Assume that △H° and △S° are independent of temperature. Calculate the temperature at which the formation of MgO switches. from spontaneous to non-spontaneous or vice versa? [Hint: Mg(s) 十➔MgO(s）；△H° = -602kJ I mo!; △S° = -1081 I K · mol] (A)2,574K, (B)3,574K, (C)4,574K, (D)5,574K, (E) none of above