Question

URGENT ...

1.calculati cantitatea de oxid de magneziu (Mg1Ox1 (cu x sau fara nu stiu)) ce contine 56 g Mg
2.Cate g de clor se gasesc in 222g clorura de calciu (CaCl2) ..?

Answer 1

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 :)