1.Assume that the measured freezing point of pure cyclohexane using your thermometer was 6.0 °C. A 0.50 molal solution of benzil (molar mass = 154.2 g/mol) lowers the freezing point of cyclohexane to -3.8 °C. What is the value of Kf for cyclohexane using the above data? 2. If 0.300 g of one of the unknown solids was dissolved in 25.0 mL cyclohexane (d = 0.780 g/mL), using the Kf from the previous problem, what is the molar mass of the unknown if the new freezing point is

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Chapter11: Properties Of Solutions
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Problem 111AE: An unknown compound contains only carbon, hydrogen, and oxygen. Combustion analysis of the compound...
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1.Assume that the measured freezing point of pure cyclohexane using your thermometer was 6.0 °C. A 0.50 molal solution of benzil (molar mass = 154.2 g/mol) lowers the freezing point of cyclohexane to -3.8 °C. What is the value of Kf for cyclohexane using the above data?

2. If 0.300 g of one of the unknown solids was dissolved in 25.0 mL cyclohexane (d = 0.780 g/mL), using the Kf from the previous problem, what is the molar mass of the unknown if the new freezing point is 4.3 °C?

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