=0.125mol∕kg Since both solution freezes at the same temperature, their molalities are equal. ‌ Molality of ‌x‌=‌ Molality of urea ‌\‌=0.125mol∕kg Moles of x= Molality × mass of water ‌=0.125×1 ‌⇒‌‌0.125mol ‌ Molar mass of ‌x‌=‌