M(Fe3O4) = 3*56 + 4*16 = 232
w(Fe) = (3*M(Fe))/M(Fe3O4) = (3*56)/232 = 0,7241 или 72,41%
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M(Fe3O4) = 3*56 + 4*16 = 232
w(Fe) = (3*M(Fe))/M(Fe3O4) = (3*56)/232 = 0,7241 или 72,41%