Răspuns:
CnH2n+ HBr----> CnH2n+1Br
100g produs...contine 65,04gBr
14n+81, g...........................80g
8000-=65,04( 14n+81) A,Br=80g/mol
Explic
n=3 C3H6 propena
1mol..............................1mol
CH2=CH-CH3+ HBr---> CH3-CHBr-CH3
0,25mol......................................x
x= niu=0,25mol C3H7Br
m= niuxmiu= 0,25(36+7+80)g= 30.75g C3H7Br