1mol 1mol 1mol
CH2=CH2+ Br2---------> CH2Br-CH2Br dibromo- etan !!!!!
n= 0,0425........0,0425........0,0425
n(niu-) derivat= 8g/ (24gC+4gH+160gBr)g/mol= 0,0425mol
n(niu) etena= 1,4l/ 22,4l/mol= 0,0625mol
n,teor= 0,0425mol
n,practic= 0,0625mol nu se transforma toata etena !
eta =n,teorx1oo/n,practic=> 0,0425x100/0,0625=..................calculeaza
m,Br2= nxM=> m= 0,0425molx 160g/mol=................ calculeaza !!!!!