Freezing point

What is the freezing point in (C) of each of the solutions below? For water, Kf=1.86 (Ckg)/mol. The vapor pressure of water at 45.0 C is 71.93mm Hg.

1. A solution of 12.5 g of urea, CH4N2O, in 135 g of water at 45 C

2. A solution of 12.5 g of LiCL in 135 g of water at 45 C assuming complete dissociati…