Question

A liquid possessing which of the following characteristics will be most suitable for determining the molecular mass of a compound by cryoscopic measurements?
a.That having low freezing point and small enthalpy of fusion
b.That having high freezing point and small enthalpy of fusion
c.That having hifh freezing point and small enthalpy of vapourization
d.That having large surface tension

Answer 1

b. `K_(f)`should be high so as to get a high value of `DeltaT_(f)`
Now `K_(f) prop (T_(f)^(2))/(Delta_(vap)H)`