Clausius–Clapeyron equation: -AHvap In P = RT

Introduction to General, Organic and Biochemistry
11th Edition
ISBN:9781285869759
Author:Frederick A. Bettelheim, William H. Brown, Mary K. Campbell, Shawn O. Farrell, Omar Torres
Publisher:Frederick A. Bettelheim, William H. Brown, Mary K. Campbell, Shawn O. Farrell, Omar Torres
Chapter5: Gases, Liquids, And Solids
Section: Chapter Questions
Problem 5.104P
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Question

Suppose the vapor pressure of a substance is measured at two
different temperatures. (a) By using the Clausius–Clapeyron
equation (Equation 11.1) derive the following relationship
between the vapor pressures, P1 and P2, and the absolute temperatures
at which they were measured, T1 and T2:

 

(b) Gasoline is a mixture of hydrocarbons, a component
of which is octane (CH3CH2CH2CH2CH2CH2CH2CH3).

Octane has a vapor pressure of 13.95 torr at 25 °C and a vapor
pressure of 144.78 torr at 75 °C. Use these data and the equation
in part (a) to calculate the heat of vaporization of octane.
(c) By using the equation in part (a) and the data given in part
(b), calculate the normal boiling point of octane. Compare
your answer to the one you obtained from Exercise 11.81.
(d) Calculate the vapor pressure of octane at -30 °C.

 

Clausius–Clapeyron equation:
-AHvap
In P =
RT
Transcribed Image Text:Clausius–Clapeyron equation: -AHvap In P = RT
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