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?

Introduction to General, Organic and Biochemistry
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ISBN:9781285869759
Author:Frederick A. Bettelheim, William H. Brown, Mary K. Campbell, Shawn O. Farrell, Omar Torres
Publisher:Frederick A. Bettelheim, William H. Brown, Mary K. Campbell, Shawn O. Farrell, Omar Torres
Chapter6: Solutions And Colloids
Section: Chapter Questions
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May you please do question one and two.
th proper tempo)
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
3002770095-8 Iomitanza
(TA) doissoqob saior isson
aroituloe ni otuloe awardinu sdt lo noitestmoonoo lalo
in Silto zeem asloM
65599
Name
5.9
noitufos all of bobbe stulos nwone to 228M
8-12
a. From the data above, over what range of time was the cyclohexane supercooled?
b. What is the freezing point of cyclohexane?
Transcribed Image Text:th proper tempo) 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 3002770095-8 Iomitanza (TA) doissoqob saior isson aroituloe ni otuloe awardinu sdt lo noitestmoonoo lalo in Silto zeem asloM 65599 Name 5.9 noitufos all of bobbe stulos nwone to 228M 8-12 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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