a)Mr(Fe2O3)=56×2+16×3=160
б)Mr(Fe3O4)=56×3+16×4=232
в)Mr(CaCO3)=40+12+16=68
г)Mr(Na2SO4)=23×2+32+16×4=143
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a)Mr(Fe2O3)=56×2+16×3=160
б)Mr(Fe3O4)=56×3+16×4=232
в)Mr(CaCO3)=40+12+16=68
г)Mr(Na2SO4)=23×2+32+16×4=143