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When heated to decomposition, toxic fumes of nitrogen oxides are emitted. May ignite other combustible materials (wood, paper, oil, etc.). Mixture with fuels may explode. Container may explode in heat of fire. Vapor explosion and poison hazard may occur indoors, outdoors or in sewers. Decomposes in water, forming nitric acid and nitric oxide. The decomposition of nitrogen dioxide, 2NO2 —> 2NO +O2 obeys the rate law: Rate = k[NO2]2 For this reaction the rate constant, k = 1.4 x 10-2 Lmol-1 s-1 at 500 K. If the inital concentration is 1.00 mol/L, howlong