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M(Fe)=56g/mol
M(O)=16g/mol
FexOy
MFexOy=56x+16y
orównujemy masy zelaza a nastepnie masy tlenków
56x=8,4g => x=0,15 zelazo
56x+16y=11,6g => 8,4+16y=11,6 => 16y=3,2 => y=0,2 tlen
x:y = 0,15:0,2 = 3:4
Fe3O4