2HgO → 2Hg + O2;
4P + 5O2 → 2P2O5;
P2O5 + 3H2O → 2H3PO4.
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2HgO → 2Hg + O2;
4P + 5O2 → 2P2O5;
P2O5 + 3H2O → 2H3PO4.