Problem: When the following aqueous solutions are ranked in order of INCREASING vapor pressure, which solution is fourth on the list?0.2 m KNO30.2 m urea, (NH2)2CO0.1 m CaCl20.1 m glucose, (C6H12O6)

FREE Expert Solution

We’re being asked to rank the given solutions in order of increasing vapor pressure and give the 4th on the list.


The vapor pressure of a solution is related to the intermolecular forces: a stronger IMF leads to lower vapor pressure. This means the solution with the lowest vapor pressure has the strongest IMF, and vice-versa. 


We’re given the mass of solute and the volume of solvent (water). 

Recall that a solution with higher solute concentration will have a stronger IMF, resulting in lower vapor pressure. Therefore, we need to calculate the osmolality of each solution, which is given by:


Osmolality=i×moles of soluteKg Solvent


where i = van’t Hoff factor

Note that all the given volumes are in mL so we need to convert mL to L.


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Problem Details

When the following aqueous solutions are ranked in order of INCREASING vapor pressure, which solution is fourth on the list?

0.2 m KNO3

0.2 m urea, (NH2)2CO

0.1 m CaCl2

0.1 m glucose, (C6H12O6)



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