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14) The vapor pressure of ethylene glycol at 100 °C and its normal boiling point (to...
The normal boiling point of ethylene glycol is 197°C; its enthalpy of vaporisation is 801 J mol-1. Estimate the temperature at which ethylene glycol boils in a vacuum distillation, if the system was maintained at 50 Torr.
An aqueous solution of ethylene glycol, C2H6O2 has a vapor pressure of 22.4 torr at a temperature of 25 C. What would be the normal boiling point of this solution? the Kb of water is 0.52 C/m and the vapor pressure of water at 25 C is 23.8 torr.
A) TRUE B) FALSE U. Heats of vaporization are greater than heats of fusion 800 34.6°C 760 783C 10 Normal boiling 600 Diethyl/ point Ethyl alcohol (ethanol) Water Ethylene glycol 20 40 60 80 100 Temperature (00 11. Based on the figure above, the boiling point of diethyl ether under an external pressure of 0.605 atm is A40 B) 10 C) 30 D) 20 E) 0 12. What is the predominant intermolecular foree in HCN? A) dipole-dipole attraction B) ion-dipole...
Which of the following are TRUE statements regarding evaporation, boiling, and vapor pressure? Select as many as are applicable however points will be deducted for incorrect answers. Select one or more: The standard boiling point occurs when the vapor pressure of a compound equals 1 bar The rate of evaporation at temperatures below the boiling point is dependent on surface area The vapor pressure at dynamic equilibrium in a closer container does not depend on the amount of liquid, as...
a. Determine ethanol’s normal boiling point by slowly changing the temperature to the point where the vapor pressure equals 760 mmHg. What is this temperature? °C b. What main type of intermolecular forces must be overcome in converting each of the following from a liquid to a gas? a. N2 b. HF c. CHF3 d.CCl4 The answer options are dipole-dipole, dipole-induced dipole, induced-dipole induced-dipole, hydrogen bonding
A solution containing ethylene glycol and water has a vapor pressure of 4.87 torr at 10°C. Pure water has a vapor pressure of 9.21 torr at 10°C. What is the mole fraction of ethylene glycol in the solution? Be sure to report your answer to the correct number of significant figures.
consider the substance, ethylene glycol. The vapor pressure at 100 C is 14.9 mmHg. The enthalpy of vaporization is 58.9 kJ/mol. what is the vapor pressure of ethylene glycol at 125 C?
8. (6 pts) Determine the vapor pressure at 25 C of an aqueous ethylene glycol (CIO) solution at is 14.8% C,H602 by mass. The vapor pressure of pure water at 25 °C is 23.8 torr A) 3.52 tor B) 22.7 torr C) 1.14 torr D) 20.3 torr Show work:
figure 1 Figure 2 Liquid ethanol mm P increasing P = equilibrium vapor pressure P=0 Add System comes to equilibrium ethanol Evacuated flask, pressure zero Molecules begin to vaporize, pressure increases Molecules leave and enter liquid at equal rates, pressure reaches steady-state value 34.6 °C 78.3°C 100 °C Normal boiling point Diethyl ether Vapor pressure (torr) Ethyl alcohol (ethanol) Water Ethylene glycol 100 20 40 60 80 Temperature (°C) Copyright 2009 Pearson Prentice Hall,Inc. Click on: (Figure 2) and study...
9. What type of intermolecular attraction forces exist between molecules of CH3CH2CH2OH ? ion-dipole and dispersion only dispersion dipole-dipole and dispersion hydrogen bonding and dispersion 10. Which of the following molecules has the lowest boiling point, and which has the lowest vapor pressure? CH3CH2CH3 CH3CH2CH2OH CH3CH2CH2CH2CH2CH2CH2OH a. CH3CH2CH3 has the lowest boiling point and CH3CH2CH2CH2CH2CH2CH2OH has the lowest vapor pressure. B. CH3CH2CH2CH2CH2CH2CH2OH has the lowest boiling point and CH3CH2CH2OH has the lowest vapor pressure C. CH3CH2CH2CH2CH2CH2CH2OH has the lowest boiling...