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mFe₂O₃=56u*2+16U*3=112+48=160u
mNa₂CO₃= 23u*2+12u+16u*3=46+12+48=106u
mH₂SO₄=1u*2+32u+16u*4=2u+32u+64u=98u
mCa(OH)₂=40U+16U*2+1U*2=74u
mFe₂(So₃)₃=56u*2+32u*3+16u*9=112u+32u+144u=288u
2.mFe₂O₃=56u*2+16U*3=112+48=160u
3.mNa₂CO₃= 23u*2+12u+16u*3=46+12+48=106u
4.mH₂SO₄=1u*2+32u+16u*4=2u+32u+64u=98u
5.mCa(OH)₂=40U+16U*2+1U*2=74u
6.mFe₂(So₃)₃=56u*2+32u*3+16u*9=112u+32u+144u=288u
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