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Phosphorus pentoxide crystallizes in at least four forms or polymorphs.The most familiar one, a metastable form [1] (shown in the figure), comprises molecules of P 4 O 10.Weak van der Waals forces hold these molecules together in a hexagonal lattice (However, in spite of the high symmetry of the molecules, the crystal packing is not a close packing [2]).
The compound can also be created in the gas phase by reacting nitrogen dioxide NO 2 or N 2 O 4 with ozone: [13] 2 NO 2 + O 3 → N 2 O 5 + O 2. However, the product catalyzes the rapid decomposition of ozone: [13] 2 O 3 + N 2 O 5 → 3 O 2 + N 2 O 5. Dinitrogen pentoxide is also formed when a mixture of oxygen and nitrogen is passed through an ...
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A general formula for such cyclic compounds is [HPO 3] x where x = number of phosphoric units in the molecule. When metaphosphoric acids lose their hydrogens as H +, cyclic anions called metaphosphates are formed. An example of a compound with such an anion is sodium hexametaphosphate (Na 6 P 6 O 18), used as a sequestrant and a food additive.
It has many polymorphic forms all based largely on octahedrally coordinated niobium atoms. [3] [4] The polymorphs are identified with a variety of prefixes.[3] [4] The form most commonly encountered is monoclinic H-Nb 2 O 5, which has a complex structure with a unit cell containing 28 niobium atoms and 70 oxygen, where 27 of the niobium atoms are octahedrally coordinated and one tetrahedrally. [5]
The following chart shows the solubility of various ionic compounds in water at 1 atm pressure and room temperature (approx. 25 °C, 298.15 K). "Soluble" means the ionic compound doesn't precipitate, while "slightly soluble" and "insoluble" mean that a solid will precipitate; "slightly soluble" compounds like calcium sulfate may require heat to precipitate.
Dichlorine pentoxide is a hypothetical chlorine oxide with a chemical formula Cl 2 O 5.The most stable configuration of dichlorine pentoxide is unknown, but theory predicts that the perchloryl/chloride peroxide structure would be the most stable among various isomers, [1] such as the anhydride of chloric acid or the chlorous acid/perchloric acid mixed anhydride.
Phosphonium ion Structure of PH + 4, the parent phosphonium cation. In chemistry, the term phosphonium (more obscurely: phosphinium) describes polyatomic cations with the chemical formula PR + 4 (where R is a hydrogen or an alkyl, aryl, organyl or halogen group). These cations have tetrahedral structures.