MFe2O3=2*56+3*16=160g/mol
MCaS=40+32=72g/mol
MBaCl2=137+2*35.5=208g/mol
MFe(OH)3=56+3(16+1)=56+51=107g/mol
MCa(No3)2=40(14+48)2=124+40=164g/mol
MFe2(SO4)3=56*2+3(32+64)=288+112=400g/mol
MNa2Co3=23*2+12+48=106g/mol
Mg3(Po4)2=24*3+2(41+64)=210+72=282g/mol. Verifica