clorura de magneziu are formula MgCl2, deci masa moleculara=24+2×35.5=24+71=95 g/mol
fosfatul de aluminiu are formula AlPO4
masa moleculara=27+31+4×16=58+64=122 g/mol
carbonatul acid de calciu are formula CaHCO3
masa moleculara=40+1+12+3×16=53+48=101 g/mol