Naming P4O10

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Tiffany Chao 2H
Posts: 117
Joined: Fri Aug 09, 2019 12:17 am

Naming P4O10

Postby Tiffany Chao 2H » Sat Oct 05, 2019 6:25 pm


I'm currently doing G. 27 from the worksheet my TA gave me during discussion. ("Phosphorus and oxygen react to form two different phosphorus oxides. The mass percentage of phosphorous in one of these oxides in 43.64%; in the other, it is 56.34%.
A. Write the empirical formula of each phosphorus oxide.
B. The molar masses of the former oxide is 283.33 g/mol and that of the latter is 219.88 g/mol. Determine the molecular formula and name of each oxide.)

I'm getting confused on how to name the compound P4O10 and P4O6.
I'm getting multiple different answers. So far, it seems like it's either Phosphorus (V) Oxide (from my TA), phosphorus pentoxide, or tetraphosphorus decaoxide. Can someone help me confirm an answer?


Frederick Keith_4C
Posts: 65
Joined: Thu Sep 26, 2019 12:19 am

Re: Naming P4O10

Postby Frederick Keith_4C » Sat Oct 05, 2019 6:33 pm

They're all correct. The first one is probably correct because the TA says so lmao :P The second one is correct because its referring to its empirical formula. It often gets confusing however because many people leave off the di- prefix. The third one is the most intuitive because there are 4 phosphorus atoms and 10 oxygen atoms, and the name uses their corresponding prefixes.

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