The vapor pressure of chloroform is 173.11 mm Hg at 25 °C. A nonvolatile, nonelectrolyte that dissolves in chloroform is aspirin. Calculate the vapor pressure of the solution at 25 °C when 9.322 grams of aspirin, C9H8O4 (180.1 g/mol), are dissolved in 263.4 grams of chloroform. chloroform = CHCl3 = 119.40 g/mol. VP(solution) = mm Hg

VP (solution) = 171.56 mmHg

Explanation:

Vapor pressure of pure solvent(P°) - Vapor pressure of solution (P') = P° . Xm

Let's replace the data:

173.11 mmHg - P' = 173.11 mmHg . Xm

Let's determine the Xm (mole fraction for solute)

Mole fraction for solute = Moles of solute / Total moles

Total moles = Moles of solute + moles of solvent.

Let's determine the moles

Moles of solvent → 623.4 g / 119.4 g/mol = 5.22 moles

Moles of solute → 9.322 g / 180.1 g/mol = 0.052 moles

Total moles = 0.052 + 5.22 = 5.272 moles

Xm = 0.052 moles / 5.272 moles = 0.009 → 9/1000

173.11 mmHg - P' = 173.11 mmHg . 9/1000

P' = - (173.11 mmHg . 9/1000 - 173.11 mmHg)

P' = 171.56 mmHg

The vapor pressure of the solution is 169.25 mm Hg

Explanation:

Step 1: Data given

Vapor pressure of pure chloroform at 25 °C = 173.11 mm Hg

Mass of aspirin = 9.322 grams

Molar mass of aspirin = 180.1 g/mol

Mass of chloroform = 263.4 grams

Molar mass chloroform = 119.40 g/mol

Step 2: Calculate moles of aspirin

Moles Aspirin = mass aspirin / molar mass aspirin

Moles aspirin = 9.322 grams / 180.1 g/mol

Moles aspirin = 0.05176 moles

Step 3: Calculate moles of chloroform

Moles chloroform = 263.4 grams / 119.40 g/mol

Moles chloroform = 2.206 moles

Step 4: Calculate mol fraction of chloroform

Mol fraction chloroform = moles chloroform / total moles

Mol fraction chloroform = 2.206 moles / (0.05176 + 2.206 )

Mol fraction chloroform = 0.9777

Mol fraction aspirin = 1 - 0.9777 = 0.0223

Step 5: Calculate the vapor pressure of the solution

Vapor pressure solution = Mol fraction chloroform * vapor pressure chloroform

Vapor pressure solution = 0.9777 * 173.11 mm Hg

Vapor pressure solution = 169.25 mm Hg

The vapor pressure of the solution is 169.25 mm Hg

a chemical reaction

explanation:

in chemistry, adhesion and cohesion are attractive forces that exist between molecules. they hold the molecules together from each other. they are different in that adhesive force exists between molecules of different substance while cohesive force happens between molecules of same substance.

adhesion between water and glass causes water molecules at the edge of water and glass interface to climb up the wall in a narrow glass tube. this is called capillary action. cohesion is what gives glass its shape and causes water to form a droplet.