Answered: We mixed some ethylene glycol with 346…

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 12.98QE

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Question

We mixed some ethylene glycol with 346 g water to reduce the equilibrium vapor pressure of water from 23.76 Hg to 22.5 Hg at 25°C. The molar masses of water and ethylene glycol are 18.02 g/mol and 62.07 g/mol, respectively. Assume ideal behavior for the solution. What is the boiling point of this solution? (Hint: find the molality first, and for water, kb = .510 m/°C; boiling point of water: 100.0°C.)

Expert Solution

Step 1

According to the question,

The vapor pressure of the pure solvent is given by $= P_{o} = 23.76 H g = 0.794 a t m$

The vapor pressure of the solution is given by $= P = 22.5 H g = 0.752 a t m$

The mass of water is given by = $m = 346 g$

The molar mass of water = $18.02 g / m o l$

The molar mass of ethylene glycol $= 62.07 g / m o l$

$K_{b} f o r w a t e r i s g i v e n b y = 0.510 m / ° C$

Find- Boiling point of the solution.

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