Homework Help: Chemsitry

Posted by Anonymous on Friday, March 1, 2013 at 11:08pm.

When 3.75 g of a nonelectrolyte solute is dissolved in 405 mL of water at 25 °C, the resulting solution exerts an osmotic pressure of 897 torr.

What is molarity?
I found molarity to be 0.048.

What is the number of moles of solute?
to find moles, I multiplied it by .405 and got an answer of 0.019 moles, however, that's incorrect. What did I do wrong? Please help? Thanks!

Chemsitry - DrBob222, Friday, March 1, 2013 at 11:37pm
M = mols/L or
mols = M x L = 0.04826 x 0.405 = 0.019545
I think you just reported too few significant figures in the answer. You are allowed three and you reported only two. Of course my answer has too many.

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