Ответ:
Mr(Fe3O4) =56*3+16*4=168+64=232
w(Fe)=56*3/232*100%=168/232*100%=16800/232=72%
Mr(Fe2O3)=56*2+16*3=112+48=160
w(Fe)=56*2/160*100%=112/160*100%=11200/160=70%
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Ответ:
Mr(Fe3O4) =56*3+16*4=168+64=232
w(Fe)=56*3/232*100%=168/232*100%=16800/232=72%
Mr(Fe2O3)=56*2+16*3=112+48=160
w(Fe)=56*2/160*100%=112/160*100%=11200/160=70%