Homework Help: Chem Two

Posted by Jen on Saturday, July 14, 2012 at 6:24pm.

When 2.25 g of a nonelectrolyte solute is dissolved in 125 mL of water at 22 °C, the resulting solution exerts an osmotic pressure of 955 torr.
What is the molar concentration of the solution?
How many moles of solute are in the solution?
What is the molar mass of the solute?

Chem Two - DrBob222, Saturday, July 14, 2012 at 7:33pm
pi = MRT.
You know pi, R, and T. Solve for molarity.
M = mols/L. Solve for mols.
mols = grams/molar mass. Solve for molar mass.
Remember pi is 955/760 = ? if you use R = 0.08206.

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