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**Molecular formula:** P₄O₆
**Molar mass:** 218,89 g/mol
**Information:** Phosphorus trioxide forms a dimeric molecule P₄O₆. It is a white, very toxic, crystalline solid (appears like wax). Anhydride phosphorus acid is formed when reacting with water. It is easily oxidized.
**Use:** Phosphorus acid is prepared from it.