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 13.9-g sample of t-butanol is measured as 24.91°C, how many grams of water are present in the sample?
A) 7.0 g
B) 0.016 g
C) 0.21 g
D) 0.021 g
E) 0.76 g
Correct Answer:
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