Solved: Molar Mass from Freezing-Point DepressionA
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Problem 1PE
Molar Mass from Freezing-Point Depression
A solution of an unknown nonvolatile nonelectrolyte was prepared by dissolving 0.250 g of the substance in 40.0 g of CCI4. The boiling point of the resultant solution was 0.357 °C higher than that of the pure solvent. Calculate the molar mass of the solute.
A mysterious white powder could be powdered sugar {C12H22011). cocaine (C17H21N04). codeine (C18H21N03}. norfenefrine {CSH11N02}. or fructose {C6H1206}. When 80 mg of the powder is dissolved in 1.50 mL of ethanol {d = 0.789 g/cm3. normal freezing point -114.8 SC. Kf = 1.99 SCIm). the freezing point is lowered to -115.5 °C. What is the identity of the white powder? (a) powdered sugar, (b) cocaine. (c> codeine, (d) norfenefrine, (e) fructose.
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