P2O5+3H2O=2H3PO4
m(р-ра)=60+630=690г
w(H3PO4) =60:690≈0,087 или 8,7%
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P2O5+3H2O=2H3PO4
m(р-ра)=60+630=690г
w(H3PO4) =60:690≈0,087 или 8,7%