What is the vapor pressure of ethanol (in mmHg) at 34.9°C if its vapor pressure is 400.0 mmHg at 63.5°C? (AHvap = 39.3 kJ/mol; R = 8.314 J/K • mol) %3D

Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter9: Liquids, Solids, And Materials
Section: Chapter Questions
Problem 29QRT: The vapor pressure of ethanol, C2H5OH, at 50.0 C is 233 mmHg, and its normal boiling point at 1 atm...
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What is the vapor pressure of ethanol (in mmHg) at 34.9°C if its vapor
pressure is 400.0 mmHg at 63.5°C? (AHvap = 39.3 kJ/mol;R= 8.314
J/K mol)
Transcribed Image Text:What is the vapor pressure of ethanol (in mmHg) at 34.9°C if its vapor pressure is 400.0 mmHg at 63.5°C? (AHvap = 39.3 kJ/mol;R= 8.314 J/K mol)
Expert Solution
Step 1

Clausius-Clapeyron Equation:
If we know the vapor pressure of a liquid is known at some temperature, and if the enthalpy of vaporization then we can calculate the vapor pressure at another temperature by using the Clausius-Clapeyron Equation.

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