The freezing point of water, H₂O, is 0.000 °C at 1 atmosphere. Kf(water) = 1.86 °C/m In a laboratory experiment, students synthesized a new compound and found that when 11.14 grams of the compound were dissolved in 243.8 grams of water, the solution began to freeze at -1.369 °C. The compound was also found to be nonvolatile and a non- electrolyte. What is the molecular weight they determined for this compound? g/mol The boiling point of diethyl ether, CH3CH₂OCH₂CH3, is 34.500 °C at 1 atmosphere. K₁(diethyl ether) = 2.02 °C/m In a laboratory experiment, students synthesized a new compound and found that when 11.39 grams of the compound were dissolved in 297.6 grams of diethyl ether, the solution began to boil at 34.768 °C. The compound was also found to be nonvolatile and a non-electrolyte. What is the molecular weight they determined for this compound ? g/mol The boiling point of water, H₂O, is 100.000 °C at 1 atmosphere. K₂(water) = 0.512 °C/m In a laboratory experiment students synthesized a new compound and found that when
The freezing point of water, H₂O, is 0.000 °C at 1 atmosphere. Kf(water) = 1.86 °C/m In a laboratory experiment, students synthesized a new compound and found that when 11.14 grams of the compound were dissolved in 243.8 grams of water, the solution began to freeze at -1.369 °C. The compound was also found to be nonvolatile and a non- electrolyte. What is the molecular weight they determined for this compound? g/mol The boiling point of diethyl ether, CH3CH₂OCH₂CH3, is 34.500 °C at 1 atmosphere. K₁(diethyl ether) = 2.02 °C/m In a laboratory experiment, students synthesized a new compound and found that when 11.39 grams of the compound were dissolved in 297.6 grams of diethyl ether, the solution began to boil at 34.768 °C. The compound was also found to be nonvolatile and a non-electrolyte. What is the molecular weight they determined for this compound ? g/mol The boiling point of water, H₂O, is 100.000 °C at 1 atmosphere. K₂(water) = 0.512 °C/m In a laboratory experiment students synthesized a new compound and found that when
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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Transcribed Image Text:Boiling Point Elevation/Freezing Point Depression
AT = m K
where, for freezing point depression:
and for boiling point elevation:
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
Formula
K₁(°C/ m) Kf(°C / m)
Water
H₂O
0.512
1.86
Ethanol
CH3CH₂OH
1.22
1.99
Chloroform CHCI 3
3.67
Benzene C6H6
2.53
5.12
Diethyl ether CH3CH₂OCH₂CH3
2.02
AT = T(pure solvent) - T(solution)
AT = T(solution) - T(pure solvent)
Transcribed Image Text:The freezing point of water, H₂O, is 0.000 °C at 1 atmosphere. Kf(water)
= 1.86 °C/m
In a laboratory experiment, students synthesized a new compound and found that when
11.14 grams of the compound were dissolved in 243.8 grams of water, the solution
began to freeze at -1.369 °C. The compound was also found to be nonvolatile and a non-
electrolyte.
What is the molecular weight they determined for this compound?
g/mol
The boiling point of diethyl ether, CH3CH₂CH₂CH3, is 34.500 °C at 1 atmosphere.
K(diethyl ether) = 2.02 °C/m
In a laboratory experiment, students synthesized a new compound and found that when
11.39 grams of the compound were dissolved in 297.6 grams of diethyl ether, the
solution began to boil at 34.768 °C. The compound was also found to be nonvolatile and
a non-electrolyte.
What is the molecular weight they determined for this compound?
g/mol
The boiling point of water, H₂O, is 100.000 °C at 1 atmosphere. K₁(water) = 0.512
°C/m
In a laboratory experiment, students synthesized a new compound and found that when
12.61 grams of the compound were dissolved in 274.3 grams of water, the solution
began to boil at 100.392 °C. The compound was also found to be nonvolatile and a non-
electrolyte.
What is the molecular weight they determined for this compound?
g/mol
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