#
**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:

$\overline{){\mathbf{Osmolality}}{\mathbf{=}}{\mathbf{i}}{\mathbf{\times}}\frac{\mathbf{moles}\mathbf{}\mathbf{of}\mathbf{}\mathbf{solute}}{\mathbf{Kg}\mathbf{}\mathbf{Solvent}}}$

where **i = van’t Hoff factor**.

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

###### 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 KNO_{3}

0.2 m urea, (NH_{2})_{2}CO

0.1 m CaCl_{2}

0.1 m glucose, (C_{6}H_{12}O_{6})

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the The Colligative Properties concept. You can view video lessons to learn The Colligative Properties Or if you need more The Colligative Properties practice, you can also practice The Colligative Properties practice problems .

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Trufan's class at UHD.