mC3H7Br=3*12u+7*1u+80u=123u
mC3H7I=3*12u+7*1u+127u=170 u
mC3H7F=3*12u+7*1u+19u=62 u
mC3H7Cl=3*12u+7*1u+35,5u=78,5u
C3H7F, C3H7Cl, C3H7Br, C3H7I