How many grams of sucrose(Molecular weight=342) should be dissolved in 100 g water in order to ..

How many grams of sucrose(Molecular weight=342) should be dissolved in 100 g water in order to produce a solution with 105.0 degree celcius difference between the freezing point and the boiling point(kf=1.86 degree celcius per molal; kb=0.51degree celcius per molal)