Homework Help: Physical Chemistry

Posted by Lan on Thursday, October 12, 2006 at 3:14am.

When 3.78 g of nonvolatile solute is dissolved in 300.0 g of water, the freezing point depression is 0.646 o C. Calculate the molar mass of the solute. The cryoscopic constant of water is 1.86 K kg mol -1.

When 3.78 g of nonvolatile solute is dissolved in 300.0 g of water, the freezing point depression is 0.646 o C. Calculate the molar mass of the solute. The cryoscopic constant of water is 1.86 K kg mol -1.

DeltaTf= molality*Kf
.646=molrSolute/.3 * 1.86
.646=3.78/molmass/.3 * 1.86
solve for molmass.

No one has answered this question yet.

Answer this Question

Related Questions

chemistry - The freezing point of a 0.010 m aqueous solution of a nonvolatile ...
chemistry - A compound was found to be composed of the following amounts of ...
Chemistry II - An unknown solute (a nonelectrolyte) was obtained and 5.37 g was ...
Physical Chemistry - When 1.33 g of a nonpolar solute was dissolved in 50.0 g of...
chem - freezing point - When 18 g of ethylene glycol C2H6O2 is dissolved in 150 ...
chemistry - Calculate the freezing point of 0.15 m calcium chloride aqueous ...
Chemistry II - 100 grams of KNO3 is dissolved in one liter of water. Calculate ...
Chemistry - 3.92g of a nondissociating compound are dissolved in 400.g of liquid...
chemistry - Calculate the boiling point elevation of a solution containing 22.8 ...
chemistry - Calculate the boiling point elevation of a solution containing 22.8 ...

For Further Reading

First Name:
School Subject:
Answer: