1. Calculezi masa moleculara a MgO: M=24+16=40g/mol
In 40g MgO avem..... 24g Mg
In x g MgO avem.......56 g Mg.
x=56*40/24=93.33g MgO
2. M=40+2*35.5=111g/mol
111g CaCl2...........71g Cl
222g CaCl2..........x g Cl
x=142g Cl
Mai verifica inca o data calculele :)