The molal depression constant for water is 1.86°C. The freezing point of a 0.05-molal solution of a non-electrolyte in water is
-1.86°C
-.0.93°C
-0.093°C
0.93°C
∆Tf=Kf×Molality=1.86×0.05=0.093 Thus, freezing point=0-0.093=-0.093