Problem: The vapor pressure of benzene, C6H6, is 100.0 torr at 26.1 oC. Assuming Raoult’s law is obeyed, how many moles of a nonvolatile solute must be added to 100.0 mL of benzene to decrease its vapor pressure by 10.0% at 26.1 oC? The density of benzene is 0.8765 g/cm3.

FREE Expert Solution

Step 1

Pbenzene =(100.0 torr)(10.0%100) = 10 torr


Step 2

Pbenzene =P°benzeneχbenzeneχbenzene =PbenzeneP°benzene χbenzene =10 torr100 torr

χbenzene = 0.1


90% (190 ratings)
View Complete Written Solution
Problem Details

The vapor pressure of benzene, C6H6, is 100.0 torr at 26.1 oC. Assuming Raoult’s law is obeyed, how many moles of a nonvolatile solute must be added to 100.0 mL of benzene to decrease its vapor pressure by 10.0% at 26.1 oC? The density of benzene is 0.8765 g/cm3.

Learn this topic by watchingThe Colligative Properties Concept Videos
All Chemistry Practice Problems The Colligative Properties Practice Problems
Q.You make a solution of a nonvolatile solute with a liquid solvent. Indicate whether each of the following statements is true or false.(a) The freezing...
Q.A solution contains 0.111 mol H2O and an unknown number of moles of sodium chloride. The vapor pressure of the solution at 30 oC is 25.7 torr. The vap...
Q.Does a 0.10 m aqueous solution of NaCl have a higher boiling point, a lower boiling pointpoint, or the same boiling point as a 0.10 m aqueous solution...
Q.Osmosis is the process of a solvent moving from one compartment to another, across a semipermeable membrane, toward higher solute concentration. Osmot...
See all problems in The Colligative Properties

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 Zellmer's class at OSU.