What is the molality of ethanol,C₂H₅OH,in an aqueous solution that is 36.4% ethanol by mass? A)1 m B)0 m C)12 m D)19 m E)97 m

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Quizplus · Accepted Answer

To find the molality, assume 100 g of solution. This means 36.4 g of ethanol and 63.6 g of water. Convert the mass of ethanol to moles (36.4 g / 46.07 g/mol = 0.79 mol). Convert the mass of water to kilograms (63.6 g = 0.0636 kg). Molality (m) is moles of solute per kilogram of solvent: 0.79 mol / 0.0636 kg = 12.42 m, which rounds to 12 m.

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