freezing point of pure benzene is 5.4 centigrade.

freezing point of pure benzene is 5.4 centigrade.when we solve 1.15gram of nephathaline in 100gram of benzene.the freezing point of the solution wil be 4.95 centigrade. cryoscopic constant of benzene is 5.12,what will be the molecular weight of benzene.
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