Answered: Temperature (°C) 70 65 60 55 50 45 40…

Macroscale and Microscale Organic Experiments

7th Edition

ISBN:9781305577190

Author:Kenneth L. Williamson, Katherine M. Masters

Publisher:Kenneth L. Williamson, Katherine M. Masters

Chapter5: Distillation

Section: Chapter Questions

Problem 4Q

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A) When 1.0105 g of an unknown was added, the freezing point of the solution was determined to be 41.8 °C. Calculate the change in the freezing point, and then calculate the molality of the solution. The Kf of lauric acid is 3.90 °C⁄?. B) Using the determined molality, calculate the number of moles of unknown present, and then calculate the molar mass of the unknown. 9.467 grams of Lauric acid was used

Temperature (°C)
70
65
60
55
50
45
40
35
30
Freezing Point Determination: Pure Solvent
10
20 40
4
D
60
100
80
Time (seconds)
120
140
160
Liquid cooling
y = -0.3333x + 63.2
R² = 0.9889
Liquid Freezing
y = -0.0255x+44.929
R² = 0.989
◆ Liquid Cooling
I Freezing

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