Question: A solution contains 0.1 mole nepthalene and 0.9 mole benzene was cooled upto a temperature T, the solution was then seperated from solid in a beaker and it was heated upto 353K temp where thr solution was found to be 670 torr. Given that P°f and P°b of benzene is 278.5k and 353k.?H fusion is 10.67kj/mol. Calculate temperature T to which it was cooled and mass of solid benzene which froze out.