The Freezing Point (T_f) for T-Butanol Is 25

question 13

Multiple Choice

The freezing point (T_f) for t-butanol is 25.50°C, and K_f is 9.1°C/m. Usually t-butanol absorbs water on exposure to the air. If the freezing point of a 13.7-g sample of t-butanol is measured as 24.81°C, how many grams of water are present in the sample?

• A) 8.3 g
• B) 0.019 g
• C) 0.18 g
• D) 0.025 g
• E) 0.91 g

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