How many grams of sucrose should be dissolved in 100g water in order to produce a solution having difference between the freezing point and the boiling point temperatures at 105.00C ?

Given,    Tb - Tf =105ocTb= BP of a solution   ;     Tf = FP of a solutionFor water,                       Kb = 0.52 KKgmole-1    ,      Kf =1.86 KKgmole-1  Given,    Tb - Tf =105oc   Given ,    Wwater=100gmWsucrose = 72.8gm