The freezing point of ethanol CH3CH₂OH is -117.30°C at 1 atmosphere. A nonvolatile, nonelectrolyte that dissolves in ethanol is chlorophyll. If 13.92 grams of chlorophyll, C55H72MgN4O5 (893.5 g/mol), are dissolved in 186.9 grams of ethanol ... The molality of the solution is The freezing point of the solution is m. °C.
The freezing point of ethanol CH3CH₂OH is -117.30°C at 1 atmosphere. A nonvolatile, nonelectrolyte that dissolves in ethanol is chlorophyll. If 13.92 grams of chlorophyll, C55H72MgN4O5 (893.5 g/mol), are dissolved in 186.9 grams of ethanol ... The molality of the solution is The freezing point of the solution is m. °C.
Principles of Modern Chemistry
8th Edition
ISBN:9781305079113
Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Chapter11: Solutions
Section: Chapter Questions
Problem 74AP
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Transcribed Image Text:Boiling Point Elevation/Freezing Point Depression
AT = m K
Where:
AT = T(solution) - T(pure solvent) *
m = (# moles solute / Kg solvent)
Kb = boiling point elevation constant.
Kf = freezing point depression constant.
K₁ and Kf depend only on the SOLVENT. Below are some common values. Use these values for the calculations that
follow.
Solvent
Water
Ethanol
Chloroform
Benzene
Diethyl ether
Formula
H₂O
CH3CH₂OH
CHCI 3
C6H6
CH3CH₂CH₂CH3
Kb (°C/ m) Kf (°C / m)
0.512
1.22
3.67
2.53
2.02
-1.86
-1.99
-5.12
*Please note that AT as defined above will be a negative number for freezing point depression. Therefore, Kf must also
be given as a negative number.
Transcribed Image Text:The freezing point of ethanol CH3CH₂OH is -117.30°C at 1 atmosphere. A nonvolatile, nonelectrolyte that dissolves in
ethanol is chlorophyll.
If 13.92 grams of chlorophyll, C55H72MgN405 (893.5 g/mol), are dissolved in 186.9 grams of ethanol …..
The molality of the solution is
The freezing point of the solution is
m.
°C.
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