Boiling point at a certain pressure

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To calculate the boiling point of a liquid at a pressure different from standard temperature, the Clausius-Clapeyron equation is recommended over the ideal gas law, as it directly addresses vapor-liquid equilibrium. The challenge lies in determining the heat of vaporization, which is necessary for applying the Clausius-Clapeyron equation. The ideal gas law is deemed inappropriate for this purpose, as it does not account for the specific thermodynamic conditions of phase changes. Participants in the discussion emphasize the importance of using the correct thermodynamic principles to achieve accurate results. Understanding these concepts is crucial for solving problems related to boiling points at varying pressures.
kthouz
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How can one calculate the boiling of a liquid at a pressure different from standard temperature?

Am trying to do it using the ideal gas equation,

(PV)/T=(P'V')/T'
Where P is the STP, V is 22.4l, T= boiling point at STP, P'= new pressure, V' is the new volume and T' is to be found. But is it easy to find V'.

But I found another equation of Clausius-Clapeyton which involves the heat of vaporisation. Using this equation, the problem is finding the heat of vaporisation. Can anyone help me?
 
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The ideal gas law is the wrong equation to use (since it has nothing to do with vapor-liquid equilibrium) but the Clausius-Clapeyron equation is the correct equation to use (since it is derived by specifically focusing on vapor-liquid equilibrium thermodynamics).
 

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