Pure nitrobenzene boils at 210.88 deg C and freezes at 5.7 deg C.?

It has a boiling point elevation constant of 5.24 deg C/m and a freezing point depression constant of 7 deg C /m, both expressed in units of deg C and molality. A solution of an unknown solute dissolved in nitrobenzene boils at 224 deg C. At what temp in deg C should this solution freeze? ume that the solute is not volatile and doesn't ionize and doesnt ociate in the solution