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Consider a solution formed by dissolving 40.84 g of an unknown, nonvolatile, molecular solute in enough cyclohexane (a nonpolar organic solvent) to produce a final volume of 250.0 mL.
1) If the final solution mass is 219.27 g and its freezing point for the solution is measured to be -23.15OC; based on the freezing point depression relative to pure cyclohexane, calculate the molar mass of the solute, given that the freezing point depression constant for cyclohexane is 20.2OC kg/mol and its freezing point is 6.55OC
2) Calculate the vapor pressure produced by the solution at 25.0OC, given that the vapor pressure of cyclohexane is 98.7 Torr at the same temperature.
Consider a solution formed by dissolving 40.84 g of an unknown, nonvolatile, molecular solute in enough cyclohexane (a nonpolar organic solvent) to produce a final volume of 250.0 mL.
1) If the final solution mass is 219.27 g and its freezing point for the solution is measured to be -23.15OC; based on the freezing point depression relative to pure cyclohexane, calculate the molar mass of the solute, given that the freezing point depression constant for cyclohexane is 20.2OC kg/mol and its freezing point is 6.55OC
2) Calculate the vapor pressure produced by the solution at 25.0OC, given that the vapor pressure of cyclohexane is 98.7 Torr at the same temperature.
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Bunny GreenfelderLv2
25 Mar 2019
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