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Guest
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 Posted: Sat Apr 07, 2007 1:08 pm Post subject: Question 43 |
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| How did you come up with this equation-DT/kf=molality of solution? |
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admin
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Joined: 08 Dec 2003
Posts: 2176
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| Posted: Mon Apr 09, 2007 6:32 pm Post subject: |
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CHM 5.1.2
This equation should definitely be on your Gen Chem equation list:
Delta T = K m, where m is the molality.
The equations for boiling point elevation and freezing point depression are similar. |
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jeff
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| Posted: Sat Aug 23, 2008 10:22 pm Post subject: |
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| hi I believe there is an error. The change in temperature is in C while the constant is given in K. |
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nedaa.asba6809
Joined: 04 May 2009
Posts: 36
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| Posted: Thu Jul 16, 2009 11:41 am Post subject: |
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Well ΔT in Celsius or Kelvin is the same.
Then ΔT = 40 K |
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admin
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Joined: 08 Dec 2003
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| Posted: Thu Jul 30, 2009 3:29 pm Post subject: |
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| bump. |
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pcko282513
Joined: 17 Jul 2011
Posts: 1
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| Posted: Sun Jul 24, 2011 8:48 am Post subject: |
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The solution given is kind of confusing.
It said T/Kf=40/1.9 =21 mol/kg H2O
But shouldn't it be 21 mol/kg of Solute ??
Then we use this mol and MW of C2H6O2 to find out the mass needed...
Plus, another question.
If we are asking how much MgCl2 to be added, how do we get it? |
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