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Dinitrogen tetraoxide and nitrogen dioxide are two gases that exist in equilibrium at a range of temperatures. NO2 is a reddish brown gas wh colorless. If we represent the equilibrium as: 2 NO2(g) ⇌ N2O4(g) We can conclude that: 1. This reaction is: a) Exothermic b) Endothermic c) Neutral d) More information is needed to answer this question.