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admin
Site Admin
Joined: 08 Dec 2003
Posts: 2168
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 Posted: Sat Aug 25, 2007 8:58 am Post subject: |
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| It is definitely not common but there have been questions where the answer choices have had a difference of 0.002. Our aim is to get you ready for anything they can throw at you. |
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srinivasan5618
Joined: 21 Jun 2010
Posts: 1
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| Posted: Fri Jul 02, 2010 11:28 am Post subject: |
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| I understand how to arrive at the mole fraction, of solute but I don't understand what to do with it. Why are we subtracting it from 23.6/51?? |
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jellywing_2058
Joined: 04 May 2009
Posts: 177
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| Posted: Wed Jul 07, 2010 1:33 pm Post subject: |
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This is a colligative property of an aqueous solution (vapor pressure).
This relationship is also known as “Raoult’s Law”, which states that the partial pressure of a solvent (H2O) over a solution (H2O + glucose) or P1, is given by the vapor pressure of the pure solvent (P°) times the mole fraction of the solvent in the solution (X1). So, P1 = (X1)(P° x 1).
In a solution containing only one solute, X1 = 1 – X2, where X2 is the mole fraction of the solute.
Therefore, replacing X1 with 1-X2, gives a final equation of change in pressure (P) = (X2)(P1). |
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