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H₂SO₄ - 2*1+32+4*16= 98u
SO₃ - 32+3*16= 80u
H₃PO₄ - 3*1+31+4*16=98u
Na₂S - 2*23+32= 78u
H₂SiO₃ - 2*1+28+3*16= 78u
wszystko z ukladu okresowego :D :)