Physical Chemistry - vapor pressures

AI Thread Summary
To determine the temperature at which isopropanol and carbon tetrachloride have the same vapor pressure, the Clapeyron equation is essential. The boiling points of isopropanol (82.5°C) and carbon tetrachloride (76.7°C) indicate their vapor pressures at 1 atm. The relationship between boiling point and vapor pressure is that boiling occurs when vapor pressure equals external pressure. Given the standard enthalpies of vaporization for both substances, one can calculate the corresponding vapor pressures at different temperatures. This approach allows for finding the temperature where their vapor pressures are equal.
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Homework Statement



At what temperature will isopropanol (Tbp = 82.5C) and carbon tetrachloride (Tbp = 76.7C) have the same vapour pressure? For isopropanol and carbon tetrachloride, the standard enthalpies of vaporization are 32.54 kJ mol-1 and 44.0 kJ mol-1, respectively.

Homework Equations


Clapeyron Equation?


The Attempt at a Solution


I don't really know how to get started.

Homework Statement




Homework Equations





The Attempt at a Solution



 
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You are right about using Clapeyron equation.

What does boiling point mean? How is it related to vapor pressure?

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The only relationship I know between boiling point and vapor pressure is that the boiling point is the temperature where the vapor pressure of a liquid is equal to external pressure.
 
External pressure is 1 atm - that means you are given p1, T1 and vaporization enthalpy for each substance. That's enough to find any p2/T2 pair.
 
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