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    Finding the molar mass from an Osmotic Pressure

    An unknown, non-ionizing compound with a mass of 0.108 g is dissolved in water to make 100.0 mL of solution. If the solution has an osmotic pressure of 0.169 atm at 20.8 ºC, what is the molar mass of the substance? -------- The answer is 154.1g/mol. I got this question wrong and can't figure...