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Why are some elements such as phosphorus reported as $\ce{P2O5}$ concentrations when the materials have no $\ce{P2O5}$ in them. I would like an explanation of how the conversion is done between real life and this idealized state.
For example. the Wikipedia page on phosphoric acid states that a $\ce{P2O5}$ concentration of 70% is equivalent to nearly 100% $\ce{H3PO4}$. Can someone explain this conversion?
2026-10-27
