The chemical name of P4O9 would be tetraphosphorus nonaoxide, but this compound is not standard and may be a typo as phosphorus typically forms P4O6 or P4O10.
The chemical name of the covalent compound P4O9 is tetraphosphorus nonaoxide. However, this is not a standard nomenclature name for a phosphorus oxygen compound, as phosphorus typically forms P4O6 (phosphorus(III) oxide or tetraphosphorus hexaoxide) and P4O10 (phosphorus(V) oxide or tetraphosphorus decaoxide). The suffix 'oxide' signifies that the compound is made with oxygen. The prefixes 'tetraphosphorus' and 'nonaoxide' indicate that there are four phosphorus atoms and nine oxygen atoms, respectively. It should be noted that P4O9 is not commonly recognized and instead may be a typographical error for one of the more common phosphorus oxygen compounds, especially since it does not conform to the common oxidation states of phosphorus in its oxides.
P4O9 is an oxide of phosphorous
so it will named accordingly
There are four phosphorous atoms and nine oxygen atoms
four will be represented as "tetra"
Nine will represented as "non"
so the name of the compound will be
tetraphosphorous nonoxide
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