ex. 9 va rogg!!!!! este urgent
![Ex 9 Va Rogg Este Urgent class=](https://ro-static.z-dn.net/files/d46/7ae4e6d035f506aa311531888c55c1ea.jpg)
MBr=80 g/mol
n=m/M=>m=n*M=0,5*80=Calculezi
1 mol Br.......6,023*10^23 atomi
nr atomi Br.......x = 0,5*6,023*10^23 = Calculezi