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|Section2= |Section3= |Section4= |Section7= |Section8= }} Dinitrogen pentoxide is the chemical compound with the formula N2O5. Also known as nitrogen pentoxide, N2O5 is one of the binary nitrogen oxides, a family of compounds that only contain nitrogen and oxygen. It is an unstable and potentially dangerous oxidizer that once was used as a reagent when dissolved in chloroform for nitrations but has largely been superseded by NO2BF4 (nitronium tetrafluoroborate). N2O5 is a rare example of a compound that adopts two structures depending on the conditions: most commonly it is a salt, but under some conditions it is a polar molecule: :N2O5 (unicode:⇌) ()() ==Syntheses and properties== N2O5 was first reported by Deville in 1840, who prepared it by treating AgNO3 with Cl2. A recommended laboratory synthesis entails dehydrating nitric acid (HNO3) with phosphorus(V) oxide: :P4O10 + 12 HNO3 → 4 H3PO4 + 6 N2O5 In the reverse process, N2O5 reacts with water (hydrolyses) to produce nitric acid. Thus, nitrogen pentoxide is the anhydride of nitric acid: :N2O5 + H2O → 2 HNO3 N2O5 exists as colourless crystals that sublime slightly above room temperature. The salt eventually decomposes at room temperature into NO2 and O2. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「dinitrogen pentoxide」の詳細全文を読む スポンサード リンク
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