Mr(Fe2O3) - 56×2+16×3=112+48=160
w(Fe) - 56×2×100/160=11200/160=70%
w(O) - 16×3×100/160=4800/160=30%
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Mr(Fe2O3) - 56×2+16×3=112+48=160
w(Fe) - 56×2×100/160=11200/160=70%
w(O) - 16×3×100/160=4800/160=30%