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112 : 48
56 : 24
28 : 12
7 : 3
9. Odp C - żelazo
mFe = 56u ale mamy miec 2 więc to będzie 56*2 = 112
mO = 16 u ale mamy miec 3 więc 16 * 3 = 48
mFe₂O₃ = 56*2 + 16*3 = 160u