Формула: C%= m(Fe)/m (вещ)×100%
1)Mr( FeS)= 56+32=88
C%= 56/88×100%= 64%
2)Mr(Fe2O3)= 56×2+16×3=160
C%=112/160×100%=70%
3)Mr(Fe(OH)3)= 56+3(16+1)=107
C%=56/107×100%=52%
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Формула: C%= m(Fe)/m (вещ)×100%
1)Mr( FeS)= 56+32=88
C%= 56/88×100%= 64%
2)Mr(Fe2O3)= 56×2+16×3=160
C%=112/160×100%=70%
3)Mr(Fe(OH)3)= 56+3(16+1)=107
C%=56/107×100%=52%