Transformam volumul in moli, pentru simplitate la calcul:
n=V/Vm=17,92/22,4=0,8mmoli=0,0008moli
notam raportul molar x:y
1mol.....1mol
C3H6 + Br2 -> C3H6Br2
x............x
1mol.....2moli
C3H4 + 2Br2 -> C3H4Br4
y...........2y
Cm=n/Vs => n=0,1*0,012=0,0012moli
x+y=0,0008 => x=0,0008-y
x+2y=0,0012
=> y=0,0012-0,0008=0,0004
x=0,0008-0,0004=0,0004
x:y=0,0004:0,0004=1:1