NO2 NITROGEN DIOXIDE

Treat the odd electron like a lone pair.) (a) NO2, nitrogen dioxide (red-brown gas that pollutes the air over many cities) and (b) CIO2, chlorine dioxide (highly explosive gas used as an industrial bleach). 

NO2 nitrogen dioxide also occurs as N2O4, dinitrogen tetroxide... 

NO2 Nitrogen dioxide 134° Brown, paramagnetic gas exists in equilibrium with N204 2N02 N2O4... 

The first method has some advantages over the second and is recommended. It distinguishes between NO2 (nitrogen dioxide) and N2O4 (dinitrogen tetraoxide), two distinct compounds that would both be called nitrogen(IV) oxide under the second system of nomenclature. Two of these oxides have common (nonsystematic) names that may be encountered elsewhere N2O is often called nitrous oxide, and NO is called nitric oxide. 

Examples CH3 (methyl radical), OH (hydroxyl), OOH (hydrogenperoxyl), NO (nitric oxide), NO2 (nitrogen dioxide), O3" (ozonide ion)... 

HNO3 is commercially prepared by the Ostwald process. At high temperatures, NH3 is catalytically converted to NO, which is cooled and then air-oxidized to NO2. Nitrogen dioxide reacts with H2O to produce HNO3 and some NO. The NO produced in the third step is then recycled into the second step. More than 18 billion pounds of HNO3 was produced in the United States in 1997. 

When released into the atmosphere, NO rapidly combines with O2 to form NO2. Nitrogen dioxide and other gases emitted by an automobile, such as carbon monoxide (CO) and various unbumed hydrocarbons, make automobile exhaust a major source of air pollution. 

Learning Goal Consider the decomposition reaction of NjOj (dinitrogen pentoxide) in the gas phase. When heated, N2O5 decomposes and forms two products NO2 (nitrogen dioxide) and O2 (diatomic oxygen). The balanced chemical equation for the reaction is... 

NO2 (nitrogen dioxide) and N2O4 (dinitrogen tetrox-ide) have the same empirical formula, NO2. Confirm this by calculating the percent by mass of each element present in the two compounds. 

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