Răspuns:
Explicație:
Zn Br2
M= 65 + 2. 80=225------> 225 g/moli
225g ZnBr2-----------65g Zn---------160g Br
100 g ---------------------x------------------y
x= 100 .65 : 225 =28,89% Zn
y= 100 .160 : 225 =71,11% Br
