Phosphorus pentoxide

Phosphorus pentoxide
Names
	IUPAC names Tetraphosphorus decaoxide; Tricyclo[3.3.1.13,7]tetraphosphoxane 1,3,5,7-tetraoxide
	Systematic IUPAC name 2,4,6,8,9,10-Hexaoxa-1λ5,3λ5,5λ5,7λ5-tetraphosphatricyclo[3.3.1.13,7]decane 1,3,5,7-tetraoxide
	Other names Diphosphorus pentoxide ; Phosphorus(V) oxide; Phosphoric anhydride; Tetraphosphorus decaoxide; Tetraphosphorus decoxide
Identifiers
CAS Number	1314-56-3 ; 16752-60-6 (P4O10) ;
3D model (JSmol)	molecular form: Interactive image; crystal o′ form: Interactive image;
ChEBI	CHEBI:37376 ;
ChemSpider	14128 ;
ECHA InfoCard	100.013.852
PubChem CID	14812;
RTECS number	TH3945000;
UNII	51SWB7223J ;
CompTox Dashboard (EPA)	DTXSID701335584 DTXSID9047754, DTXSID701335584 ;
	InChI InChI=1S/O10P4/c1-11-5-12(2)8-13(3,6-11)10-14(4,7-11)9-12 Key: DLYUQMMRRRQYAE-UHFFFAOYSA-N ;
	SMILES molecular form: O=P13OP2(=O)OP(=O)(O1)OP(=O)(O2)O3; crystal o′ form: P12(=O)OP3(=O)OP4(=O)OP5(=O)OP6(=O)OP(=O)(O1)OP7(=O)OP(=O)OP(=O)OP(=O)(O2)OP(=O)OP(=O)OP(=O)(O3)OP(=O)OP(=O)OP(=O)(O4)OP(=O)OP(=O)OP(=O)(O5)OP(=O)OP(=O)OP(=O)(O6)OP(=O)OP(=O)(O7)O;
Properties
Chemical formula	P4O10
Molar mass	283.9 g mol−1
Appearance	White powder; Very deliquescent
Odor	Odorless
Density	2.39 g/cm3
Melting point	340 °C (644 °F; 613 K)
Boiling point	360 °C (sublimes)
Solubility in water	exothermic hydrolysis
Vapor pressure	1 mmHg @ 385 °C (stable form)
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	reacts with water, strong dehydrating agent, corrosive
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H314
Precautionary statements	P280, P301+P330+P331, P303+P361+P353, P305+P351+P338, P310
NFPA 704 (fire diamond)	3 0 3 W
Safety data sheet (SDS)	MSDS
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Phosphorus pentoxide is a chemical compound with molecular formula P₄O₁₀ (with its common name derived from its empirical formula, P₂O₅). This white crystalline solid is the anhydride of phosphoric acid. It is a powerful desiccant and dehydrating agent.