21. Consider the following reaction at 25℃: 2NO₂(g) →N₂O₄(g). The values of △H^o and △S^o are -58.03 kJ/mol and -176.6 (J/K)(mol), respectively. Assuming △H^o and  △S^o  are temperature independent, the calculated value of K at 100℃ is__________ .
(A) 2.54
(B) 0.0789
(C)0.789
(D) 7.89
(E)0.254 3

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