The freezing point of water, H2O, is 0.000 °C at 1 atmosphere. K(water) = -1.86 °C/m In a laboratory experiment, students synthesized a new compound and found that when 14.51 grams of the compound were dissolved in 204.3 grams of water, the solution began to freeze at -2.198 °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, H2O, is 0.000 °C at 1 atmosphere. K(water) = -1.86 °C/m In a laboratory experiment, students synthesized a new compound and found that when 14.51 grams of the compound were dissolved in 204.3 grams of water, the solution began to freeze at -2.198 °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: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter20: Chemistry Of Selected Transition Elements And Coordination Compounds
Section: Chapter Questions
Problem 114QRT
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Boiling Point Elevation/Freezing Point Depression
T = m K
where, for freezing point depression:
T = T(pure solvent) - T(solution)
and for boiling point elevation:
T = T(solution) - T(pure solvent)
| m | = (# moles solute / Kg solvent) |
| Kb | = boiling point elevation constant. |
| Kf | = freezing point depression constant. |
Kb and Kf depend only on the SOLVENT. Below are some common values. Use these values for the calculations that follow.
| Solvent | Formula | Kb(°C / m) | Kf(°C / m) |
| Water | H2O | 0.512 | 1.86 |
| Ethanol | CH3CH2OH | 1.22 | 1.99 |
| Chloroform | CHCl3 | 3.67 | |
| Benzene | C6H6 | 2.53 | 5.12 |
| Diethyl ether | CH3CH2OCH2CH3 | 2.02 |
Transcribed Image Text:The freezing point of water, H20, is 0.000 °C at 1 atmosphere. K(water) = -1.86 °C/m
In a laboratory experiment, students synthesized a new compound and found that when 14.51 grams of the compound were dissolved in 204.3 grams of water, the solution began to freeze at -2.198 °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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