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mFe2O3=2*56+3*16=160u
mNa2CO3=2*23+12+3*16=106u
mH2SO4=2*1+32+4*16=98u
mCa(OH)2=40+2*16+2*1=74u
mFe2(SO)3=2*56+3*32+3*16=256u
mFe2O3 = 160u
mNa2CO3= 106u
mH2SO4= 98u
mCa(OH)2= 74u
mFe2(SO)3= 256u