what is the freezing point depression when 153g of bromine is added to 1000g of benzene?

Answer 1

Well, the Br2 dissolves, and remains in solution as Br2 (unless the presence of a catalyst or strong light, in which it reacts).

deltaT=kf*m

molality= molesBr/1kg=153/70=2.19

look up kf for Benzene
http://hyperphysics.phy-astr.gsu.edu/hbase/tables/bpelev.html