15. The freezing point (Tf) for t-butanol is 25.50°C and Kf is 9.1°C/m. Usually t-butanol absorbs water on exposure to the air. If the freezing point of a 7.6-g sample of t-butanol is measured as 24.59°C, how many grams of water are present in the sample? (A) 0.10 g (B) 0.014 g (C) 10. g (D) 1.4 g (E) 14 g