Question

What is `P_2O_5`?

Answer 1

Well phosphorus pentoxide is a dense free-flowing white powder, that has a melting point of `340` `""^@C`....

Explanation:

It reacts with water to give phosphoric acid.......

`P_4O_10+6H_2Orarr4H_3PO_4`

........and in fact it is so hygroscopic, that when you use a tin that has been already been opened, you find a syrupy crust of phosphoric acid that you must dig beneath to get at the good stuff.

The molecular formula is `P_4O_10`; sometimes it is formulated as `P_2O_5`, i.e. as its empirical formula........