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Dinitrogen pentoxide is the chemical compound with the formula N<sub>2</sub>O<sub>5</sub>. Also known as nitrogen pentoxide, N<sub>2</sub>O<sub>5</sub> 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is an unstable and potentially dangerous oxidizer that once was used as a reagent for nitrations but has largely been superseded by NO<sub>2</sub>BF<sub>4</sub>.