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Molar mass of organic compound

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A solution that contains 9.30g organic compound per 200.0 ml of solution has an osmotic pressure of 0,171 atm at 27 degrees C. what is the molar mass of that organic compound?

Jul 22nd, 2014

soloution 

please choose me in both this is correct the other i used wrong values

Pressure = MRT 
0.17 atm = M(0.0821 Latm/molK)(300K) 
M = 0.0581 mol/L 

Since the solution contained 9.30 g/200 mL solution, this would be equivalent to 
9.30 g/200 mL X 1000 mL/L = 46.5 g/L 

Now, if you just take the ratio of those two calculations, you have: 
46.5 g/L / 0.0581 mol/L = 800 g/mol 

please choose me best


Jul 22nd, 2014

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