freezing point of Pure 2-methyl-2propanol is noted 25.50C, however it absorbs H2O as an impurity on exposure to humid air. determine how many milligrams of H2O are present in sample If the freezing point of a 100.0g sample of 2-methyl-2-propanol =24.59C? Kf=(2methyl-2propanol=4.68Ckg/mol)