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Question

If Kc equals 0.11 at 25°C for the reaction: N2O4(g) ⇌ 2 NO2(g), what is Kc for the reaction: NO2(g) ⇌ 1/2 N2O4(g)? A) 3.0 B) 0.33 C) 9.1 D) 4.5