How to Write the Formula for Diphosphorus pentoxide

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In this video we'll write the correct formula for Diphosphorus pentoxide (P4O10). • The name Diphosphorous pentoxide refers to the empirical formula. That is the lowest whole number ratio of atoms. Here we have 2 P atoms for every 5 O atoms. This was originally thought to be the molecular formula as well. • Since then it has been found that the actual molecular formula is P4O10. However the name Diphosphorous pentoxide continues to be used even though it does not accurately reflect the actual molecular formula for the compound. • Note that when we have a non-metal and a non-metal we have a molecular compound (sometimes called covalent). Molecular compounds are some of the simplest to name. • Keys for Writing the Formulas for Molecular Compounds: • Write the element symbol for both elements. • Place a subscript after each element according to its prefix. • Note: Don’t write the subscript '1'. • --------- • Prefixes • mono- 1 • di- 2 • tri- 3 • tetra- 4 • penta- 5 • hexa- 6 • hepta- 7 • octa- 8 • nona- 9 • deca- 10 • --------- • Caution: We only write mono for the second element in a molecular compound. So CO would be carbon monoxide. Monocarbon monooxide is incorrect. • --Formula Writing Resources-- • • Writing Formulas for Molecular compounds: • Naming and Formula Writing for Molecu... • • Introduction to Formula Writing: • Introduction to Naming and Formula Wr... • • For a complete tutorial on naming and formula writing for compounds, like Diphosphorus pentoxide and more, visit: • http://www.breslyn.org/chemistry/naming • • Drawing/writing done in InkScape (http://www.InkScape.org). Screen capture done with Camtasia Studio 4.0. Done on a Dell Dimension laptop computer with a Wacom digital tablet (Bamboo).

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