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**Molecular formula:** N₂O₄ **Molar mass:** 92.012 g/mol **Description:** Dinitrogen tetroxide is the dimeric form of nitrogen dioxide. It is a highly toxic, colorless gas that dissociates into nitrogen dioxide at higher temperatures. **Applications:** Dinitrogen tetroxide is used as an oxidizer in rocket engines. **Occurrence:** Dinitrogen tetroxide is present in the exhaust gases of internal combustion engines and contributes to environmental pollution, including the formation of acid rain.
