1. Benzene has a freezing point of 6.00 °C, a density of 0.8787 g/mL and a molal freezing point depression constant (Kr) of 5.12 °C kg/mol. When 0.515 g of an unknown solute was dissolved in 12.3 mL of benzene, the solution that formed was found to have a freezing point of 4.10 °C. What is the molecular mass of the unknown solute?
1. Benzene has a freezing point of 6.00 °C, a density of 0.8787 g/mL and a molal freezing point depression constant (Kr) of 5.12 °C kg/mol. When 0.515 g of an unknown solute was dissolved in 12.3 mL of benzene, the solution that formed was found to have a freezing point of 4.10 °C. What is the molecular mass of the unknown solute?
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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May you please do question one and two.

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Experiment 8 - Prelab Assignment
1. Benzene has a freezing point of 6.00 °C, a density of 0.8787 g/mL and a molal freezing point
depression constant (Kr) of 5.12 °C kg/mol. When 0.515 g of an unknown solute was dissolved in
12.3 mL of benzene, the solution that formed was found to have a freezing point of 4.10 °C. What is the
molecular mass of the unknown solute?
Time (s)
0
15
30
45
60
75
90
T (°C)
12.5
11.1
9.5
8.2
7.2
6.5
6.0
Time (s)
105
120
135
150
165
180
195
2. The following data were obtained in an experiment to determine the freezing point of cyclohexane
(C6H12).
T (°C)
5.8
5.5
5.7
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5.9
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a. From the data above, over what range of time was the cyclohexane supercooled?
b. What is the freezing point of cyclohexane?
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