15. (5 points) Calculate the vapor pressure (in torr) at 25 °C of a solution containing 49.8 mL ethylene glycol (HOCH₂CH₂OH; a non-volatile compound; density=1.11g/mL) and 285.2 g water. The vapor pressure of pure water at 25 °C is 23.8 torr. Imol 99.8 ML 55.2789 102,079 1.11g ML =

15. (5 points) Calculate the vapor pressure (in torr) at 25 °C of a solution containing 49.8 mL ethylene glycol (HOCH₂CH₂OH; a non-volatile compound; density=1.11g/mL) and 285.2 g water. The vapor pressure of pure water at 25 °C is 23.8 torr. Imol 99.8 ML 55.2789 102,079 1.11g ML =

Chemistry: Principles and Practice

3rd Edition

ISBN:9780534420123

Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer

Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer

Chapter12: Solutions

Section: Chapter Questions

Problem 12.64QE

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A forensic chemist is given a white solid that is suspected of being pure cocaine (C17H21NO4, molar mass = 303.35 g/mol). She dissolves 1.22 0.01 g of the solid in 15.60 0.01 g benzene. The freezing point is lowered by 1.32 0.04C. a. What is the molar mass of the substance? Assuming that the percent uncertainty in the calculated molar mass is the same as the percent uncertainty in the temperature change, calculate the uncertainty in the molar mass. b. Could the chemist unequivocally state that the substance is cocaine? For example, is the uncertainty small enough to distinguish cocaine from codeine (C18H21NO3, molar mass = 299.36 g/mol)? c. Assuming that the absolute uncertainties in the measurements of temperature and mass remain unchanged, how could the chemist improve the precision of her results?
The vapor pressures of several solutions of water-propanol (CH3CH2CH2OH) were determined at various compositions, with the following data collected at 45C: H2O Vapor pressure(torr) 0 74.0 0.15 77.3 0.37 80.2 0.54 81.6 0.69 80.6 0.83 78.2 1.00 71.9 a. Are solutions of water and propanol ideal? Explain. b. Predict the sign of Hsoln for water-propanol solutions. c. Are the interactive forces between propanol and water molecules weaker than, stronger than, or equal to the interactive forces between the pure substances? Explain. d. Which of the solutions in the data would have the lowest normal boiling point?
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