The boiling point of ethanol, CH3 CH₂OH, is 78.500 °C at 1 atmosphere. Kb (ethanol) = 1.22 °C/m In a laboratory experiment, students synthesized a new compound and found that when 10.16 grams of the compound were dissolved in 267.4 grams of ethanol, the solution began to boil at 78.661 °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

Chemistry
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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
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The boiling point of ethanol, CH3 CH₂OH, is
78.500 °C at 1 atmosphere.
Kb (ethanol) = 1.22 °C/m
In a laboratory experiment, students
synthesized a new compound and found
that when 10.16 grams of the compound
were dissolved in 267.4 grams of ethanol,
the solution began to boil at 78.661 °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
Transcribed Image Text:The boiling point of ethanol, CH3 CH₂OH, is 78.500 °C at 1 atmosphere. Kb (ethanol) = 1.22 °C/m In a laboratory experiment, students synthesized a new compound and found that when 10.16 grams of the compound were dissolved in 267.4 grams of ethanol, the solution began to boil at 78.661 °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 freezing point of water is 0.00 °C at 1 atmosphere.
A student dissolves 12.17 grams of iron(II) acetate, Fe(CH3COO)2 (174.0 g/mol), in 222.2 grams
of water. Use the table of boiling and freezing point constants to answer the questions below.
Kb(°C/m) Kf(°C/m)
Solvent
Formula
Water
H₂O
Ethanol
CH3 CH₂ OH
1.22
Chloroform
CHC13
3.67
Benzene
C6H6
2.53
Diethyl ether CH3 CH₂ OCH2 CH3 2.02
The molality of the solution is
The freezing point of the solution is
0.512
m.
°C.
1.86
1.99
5.12
Transcribed Image Text:The freezing point of water is 0.00 °C at 1 atmosphere. A student dissolves 12.17 grams of iron(II) acetate, Fe(CH3COO)2 (174.0 g/mol), in 222.2 grams of water. Use the table of boiling and freezing point constants to answer the questions below. Kb(°C/m) Kf(°C/m) Solvent Formula Water H₂O Ethanol CH3 CH₂ OH 1.22 Chloroform CHC13 3.67 Benzene C6H6 2.53 Diethyl ether CH3 CH₂ OCH2 CH3 2.02 The molality of the solution is The freezing point of the solution is 0.512 m. °C. 1.86 1.99 5.12
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