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April 18, 2015

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.

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