Răspuns:1)MCO2=12+16×2=44
2)MNa2SOH=23×2+32+16+1=46+58
=104
3)HNO3=1+14+16×3=15+48=63
4)AlCl3=27+35,45×3=106,35+27=133,35
5)MCaCO3=40+13+16×3=53+48=101