The Phosphorus pentoxide, also known as Phosphoric acid anhydride, is the organic compound with the formula O₁₀P₄. It belongs to the product categories of Inorganic Chemicals; Inorganics; Element oxide. Its EINECS registry number is 215-236-1. With the CAS registry number 1314-56-3, its systematic name is Tricyclo[3.3.1.1^3,7]tetraphosphoxane 1,3,5,7-tetraoxide. This white crystalline solid is the anhydride of phosphoric acid. It is a powerful desiccant. Phosphorus pentoxide is not flammable. It reacts vigorously with water and water-containing substances like wood or cotton, liberates much heat and may even cause fire.

Physical properties of Phosphorus pentoxide: (1)ACD/LogP: 6.399; (2)# of Rule of 5 Violations: 2; (3)ACD/LogD (pH 5.5): 6.40; (4)ACD/LogD (pH 7.4): 6.40; (5)ACD/BCF (pH 5.5): 42989.39; (6)ACD/BCF (pH 7.4): 42989.39; (7)#H bond acceptors: 10; (8)Index of Refraction: 1.491; (9)Molar Refractivity: 33.323 cm³; (10)Molar Volume: 115.059 cm³; (11)Surface Tension: 84.367 dyne/cm; (12)Density: 2.467 g/cm³.

Preparation of Phosphorus pentoxide: Phosphorus pentoxide is prepared by burning elemental phosphorus with sufficient supply of air:
P₄ + 5 O₂ → P₄O₁₀

Uses of Phosphorus pentoxide: 
Phosphorus pentoxide is a potent dehydrating agent as indicated by the exothermic nature of its hydrolysis:
P₄O₁₀ + 6 H₂O → 4 H₃PO₄ (–177 kJ)
However, its utility for drying is limited somewhat by its tendency to form a protective viscous coating that inhibits further dehydration by unspent material. A granular form of P₄O₁₀ is used in desiccators.

Consistent with its strong desiccating power, P₄O₁₀ is used in organic synthesis for dehydration. The most important application is for the conversion of amides into nitriles:
P₄O₁₀ + RC(O)NH₂ → P₄O₉(OH)₂ + RCN

The indicated coproduct P₄O₉(OH)₂ is an idealized formula for undefined products resulting from the hydration of P₄O₁₀.
Alternatively, when combined with a carboxylic acid, the result is the corresponding anhydride:
P₄O₁₀ + RCO₂H → P₄O₉(OH)₂ + [RC(O)]₂O

When you are using this chemical, please be cautious about it as the following:
This chemical may destroy living tissue on contact and may cause burns. In case of contact with eyes, you should rinse immediately with plenty of water and seek medical advice. Whenever you will contact it, please wear suitable protective clothing, gloves and eye/face protection.

You can still convert the following datas into molecular structure:
(1)InChI: InChI=1S/O10P4/c1-11-5-12(2)8-13(3,6-11)10-14(4,7-11)9-12
(2)InChIKey: DLYUQMMRRRQYAE-UHFFFAOYSA-N
(3)Canonical SMILES : O=P12OP3(=O)OP(=O)(O1)OP(=O)(O2)O3

The toxicity data is as follows: