Homework Help: Chemistry

Posted by Anon on Tuesday, January 29, 2013 at 9:13pm.

When 4.65 g of a nonelectrolyte solute is dissolved in 475 mL of water at 27 °C, the resulting solution exerts an osmotic pressure of 931 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?

For the M I got .0265 M.
For moles I got .129 mols.
For molar mass I got .585 g/mol.

Can someone check this for me?

Chemistry - DrBob222, Tuesday, January 29, 2013 at 10:16pm
I obtained M = 0.04976 (too many significant figures there but you can round to the desired number.)
pi = MRT
(931/760) = M*(0.08206)(300)
M = ?
Chemistry - Anon, Tuesday, January 29, 2013 at 10:20pm
If M = 0.498 do I times that by 475 mL converted to L to find out the mols and then times that answer by 4.65g to find the molar mass?
Chemistry - DrBob222, Tuesday, January 29, 2013 at 11:23pm
You typed the answer in wrong I think.
M = 0.0498

Then M = mols/L
0.0498 = mol/0.475L and
mol = 0.0498 x 0.475 = about0.0237

Then mol = grams/molar mass or
molar mass = grams/mol = 4.65/0.0237 = about 197

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