Răspuns:
masa de propena pura
p=m,px100/mi----> m,p= 320x90/100g=288g
moli propena, stiind miu,C3H6=42g/mol
niu=m/miu=288/42mol=6,857mol
1mol...................1mol
CH2=CH-CH3+ Br2===> CH2Br-CHBr-CH3
6,857mol..............x
x=niu=6,857mol Br
c,m=niu/V---> V=niu/c,m= 6,857/2 l= 3,43 l solutie
Explicație: